POLYLUBE_design-guide copy

Transcription

103 Industrial Park DrIVE / P.O. Box 176 / Walkerton, IN 46574 USA / 800.918.9261 / Ph: 574.586.3145 / Fx: 574.586.7336 / polygoncompOSITES.com
POLYLUBE®
COMPOSITE BEARINGS
& BUSHINGS
POLYMED®
COMPOSITE MEDICAL
TUBING
POLYSLIDE®
COMPOSITE CYLINDER
TUBING
POLYSTRUCTURE®
COMPOSITE SHAPES
& FORMS
POLYGON TUBE™
ELECTRICAL GRADE
COMPOSITE TUBING
TABLE OF CONTENTS
HIGHLIGHTS
POLYLUBE Design guide
SELF-LUBRICATED COMPOSITE BEARINGS
INTRODUCTION
3-9
Polygon’s company history and product manufacturing divisions.
PRODUCT INFORMATION
10-29
POLYLUBE FIBER SERIES BEARINGS
10-12
POLYLUBE MRP AND MRP-SL BEARINGS
13-14
POLYLUBE GLASS TAPE BEARINGS
15-19
POLYLUBE IFR BEARINGS
20-21
POLYLUBE HIGH TEMPERATURE BEARINGS
22-23
The ideal candidate for highly loaded bearing joints requiring low friction and low wear over 1.5 million cycles.
A superb bearing material for agriculture, construction and material handling applications requiring good
load capacity, low frictional values, and superior wear characteristics.
An excellent solution for bearing applications where stick/slip is of concern.
★
2
★
A bearing with optimized structure for resistance to applications with repeated impact fatigue or
stress/strain conditions.
A bearing designed for environments over 450˚F or where thermal expansion stability is critical.
POLYLUBE GUIDE ROD BUSHINGS
24-29
BEARING DESIGN PRINCIPLES
30-35
STANDARD SIZES
36-46
A guide rod bushing for pneumatic cylinder applications where corrosion, high misalignment or edge
loading, low friction and excellent wear characteristics are desired.
SUPPLEMENTARY DATA
47
HIGHLIGHTS
INTRODUCTION
POLYGON COMPANY
Founded in 1949 by a chemist working on advanced composite materials
during World War II at the U.S. WrightPatterson Air Force base, Polygon Company has grown into an engineered materials company
with multiple manufacturing facilities and global distribution and sales offices around the world. Polygon’s original
patents on composite self-lubricating bearings in the mid 1960’s stand as a hallmark in the development of journal bearing technology. Since that time, Polygon’s ongoing research and development activities have resulted in multiple patents on innovative self-lubricating products as well as
proprietary manufacturing capabilities that allow Polygon to project superior value in the journal
bearing marketplace.
“Polygon’s original
patents stand as a hallmark in the development of
bearing technology.”
Corporate research and development activities, including an in-house
bearing test laboratory, are located in the company’s corporate offices
and primary manufacturing location in Walkerton, Indiana (approximately 90 miles east of Chicago, Illinois).
★
3
★
POLYGON’S CORPORATE STRUCTURE IS CENTERED AROUND
FIVE PRODUCT MANUFACTURING DIVISIONS:
•
•
•
•
•
PolyLube™ self-lubricating composite bearings.
PolyMed™ (USP Class VI approved) medical composites for minimally invasive surgeries.
The Polygon Tube™ double insulation for hand-held power tools and electrical and distribution.
Electrical Distribution and Control composite insulation materials.
Continuous Fiber Thermoplastic (CFT™) materials and pultruded products.
INTRODUCTION
HIGHLIGHTS
WHAT IS A COMPOSITE BEARING?
“This high strength
laminate construction
allows for the use of a
thin wall bearing.”
Polygon’s line of PolyLube™ bearings
uses a fiberglass filament wound
structure which incorporates a proprietary epoxy resin matrix that results
in a very high strength bearing that is
naturally concentric with no seam or
overlap. This high strength laminate
construction allows for the use of a
thin wall (1/16" to 1/8") bearing
which reduces the size and weight of
the assembly. The resulting composite material exhibits a very low coefficient of friction coupled with high
load-bearing capacity.
POLYLUBE™ LINER DESIGN
PolyLube bearings utilize a proprietary design that ensures the anti-friction backing is locked into
the backing material with more than a simple adhesion effect. This proprietary design also drives
excellent resistance to impact fatigue and cavitation problems.
★
4
★
PolyLube Fiber Series Wear Surface
The PolyLube™ Fiber and MRP series bearings have their liners applied in a dry manufacturing
mode. They are inherently very resistant to impact because the liner backing has high strength
fiberglass filaments interwoven into the liner backing.
The differences in liner construction can be seen most dramatically during three periods: first,
how coefficient of friction and wear change during the break-in period, second, how the bearing
handles contamination in a dirty or unsealed environment, and third, long term bearing life. Differences in liner construction can also impact performance in the following areas:
PolyLube MRP Wear Surface
• Coefficient of Friction—The required breakaway torque & startup forces required.
• Impact Fatigue—How the bearing handles shock or impact loading.
• Amount of Wear—The orientation of the PTFE in relation to the mating surface as well as the
content of the PTFE will impact the amount of wear the finished journal bearing will exhibit.
• Time for Achieving Sufficient PTFE Film Transfer—The liner construction will impact the length of
time as well as the operating conditions required to have the PTFE film properly transfer from
the inner diameter of the bearing to the outer diameter of the mating surface.
HIGHLIGHTS
INTRODUCTION
GREASED VERSUS GREASELESS JOURNAL BEARING COMPARISONS
GO GREASELESS!
40,000
MAX. DYNAMIC CAPACITY-PSI
(LESS THAN 5 SFPM)
PolyLube™ bearings not only exhibit excellent load capacities, low frictional values
and resistance to corrosion, they also allow for true self-lubrication. As a result, all
secondary lubrication systems and design guidelines that are related to lubricants
can be eliminated from industrial applications.
30,000
20,000
ONLY
WHEN
LUBRICATED
10,000
WHAT ARE THE DESIRED CHARACTERISTICS OF
JOURNAL/PLANE BEARING MATERIALS?
Cast
Bronze
Porous
Bronze
Alloyed
Bronze
In general, journal/plane bearing materials should have the following characteristics
in order for the bearing assembly to be properly designed:
1. TRULY SELF-LUBRICATING. Many materials
claim to offer some level of self-lubrication;
however, many (especially sintered metal
structures) lose their self-lubrication properties quickly during operation. When the lubrication fails, metal-on-metal contact results.
Premature bearing failure generally quickly
follows.
WITH
NO
LUBRICATION
SteelHardened
Backed
Steel
Bronze
REQUIRES
LUBRICATION
Zinc
Aluminum
FabricReinforced
Phenolic
Reinforced
Teflon
POLYLUBE™
SELF
LUBRICATING
MATERIAL
4. QUICK TRANSFER OF PTFE FILM TO SHAFT.
The key to self-lubricating bearings is the rapid
transfer of PTFE from the bearing ID to the shaft
surface during the initial break-in phase. The film
of PTFE on the shaft functions as a dry lubricant,
which reduces the friction and wear rate.
★
5. FIBER ORIENTATION TO MINIMIZE FRICTION.
In a properly designed self-lubricating bearing,
the bearing will exhibit a low coefficient of friction when the contact surface is on the ends of
the PTFE fibers.
2. EMBEDDABILITY. A properly designed composite journal bearing should have the ability for
the bearing liner to absorb or “embed” within itself wear debris or airborne dirt particles.
“The PTFE super-filaments
used in the bearing wear
surface exhibit tensile
strengths 20-times greater
than traditional PTFE
resins.”
6. HIGH PERCENT OF PTFE NEAR THE SURFACE.
It is not sufficient to simply have PTFE fibers
on the wear surface. A high percent of PTFE is
desirable near the surface of the bearing to
provide an ample amount of dry lubricant for
wear and friction reduction.
3. PV RATING. The PV rating should be easy to
understand, and fit most application environments with a good match between the bearing pressure and surface velocity
capabilities.
JOURNAL BEARING DYNAMIC LOAD COMPARISONS
JOURNAL BEARING STATIC LOAD COMPARISONS
Filled PTFEs and Unfilled Polyethylenes
Filled PTFEs and Unfilled Polyethylenes
Molded Nylons and Acetals
ENGINEERED WEAR SURFACES
MATERIAL FAMILY COMPARISONS
ENGINEERED WEAR SURFACES
MATERIAL FAMILY COMPARISONS
Molded Nylons and Acetals
Single or Multi-Lubricated Filled
Molded Composites
Sintered Iron-Bronze
Metal Backed, Plastic Lined
Greased Bearings
30% Reinforced Thermoplastics
Metal Backed
Single or Multi-Lubricated Filled
Molded Composites
Sintered Iron-Bronze
2 fpm
Metal Backed, Plastic Lined
Greased Bearings
KEY
30% Reinforced Thermoplastics
Metal Backed
PolyLube™ Bronze Tape Liner
PolyLube™ PTFE Bronze Tape Liner
PolyLube™ Fiber
Series Bearing
0
2
4
6
20
8 10
0
40
30
40
BEARING PRESSURE (psi 1,000’s)
50
60
PolyLube™ PTFE Fiber Series Bearing
0
2
4
6
20
8 10
0
40
30
40
50
BEARING PRESSURE (psi 1,000’s)
5
★
HIGHLIGHTS
INTRODUCTION
WHAT “COMPOSITES PROFESSIONALS” MEANS TO YOU!
Unlike any other company in the journal bearing market, Polygon is the only organization with
composite self-lubricating bearings as a primary product focus. Other bearing organizations see
this product line as a necessary offering to satisfy the design needs of the OEM market.
“Many materials claim to
offer some level of selflubrication; however, many
lose their self-lubrication
properties quickly during
operation.”
FOR POLYGON, THIS FAMILY OF MATERIALS IS OUR CORE COMPETENCY, IT IS WHAT WE DO, IT IS
WHAT WE ARE PROFESSIONALS AT. Polygon can better predict the performance of this type of
bearing, can better define what factors drive product performance, and has a stronger manufacturing infrastructure to support your business needs. Our abilities as an organization to specify
sizing, assembly, and design parameters are unmatched in the self-lubricating composite bearing industry. Why? Because it is what we do. The value to you? Polygon Company has the best
designed, highest performing bearing material available, at the best cost in the industry.
THE TRUE VALUE OF SELF-LUBRICATION
Today’s design engineering community must continually search out materials that allow for an
increase in performance capabilities in conjunction with total, system based cost savings. The
question still remains: What is the true value of self-lubrication?
★
6
★
The environmental issues around grease are
only now coming to light. With self-lubrication all environmental contaminants are
eliminated.
Experienced OEM design engineers know that one of the most common failures for bearing designs is when lubrication is not properly maintained. Conceptually, a bearing design that is properly sealed and lubricated should result in trouble-free field service. Unfortunately, this is not the
case in most applications. In today’s environments it is fairly common that greased joints are not
maintained properly. As a result, the boundary/mixed lubrication condition diminishes and the
bearing life is limited.
TOTAL COST OF OWNERSHIP ANALYSIS
8
Self-lubricating bearings eliminate secondary
pin and housing fabrication required for
greased bearings.
Cost Factor
6
4
2
0
Assembly
Cost
Housing
Fabrication
Cost
Zerk
Assembly
Cost
Greased Bearing
Factory
Greasing
Unit
Purchase
Price
Ongoing
Maintenance
Cost
Total
Cost of
Ownership
Self-Lubricating Composite Bearing
HIGHLIGHTS
INTRODUCTION
THE TRUE VALUE OF SELF-LUBRICATION (CONTINUED)
In addition to the potential of failure if bearings are not properly lubricated, the total cost of ownership for a bearing that must be lubricated is greater than the total cost of a self-lubricating composite bearing. Most OEM’s clients have found that the cost of purchasing, assembling, and
maintaining a greased bearing joint is at a minimum 1.5 times to a maximum of 4 times the cost
of a self-lubricating bearing joint. Equipment rental yards are becoming increasingly sensitive to
the liability associated with greased bearings.
At the most simple level, external lubrication introduces an uncontrollable design variable for
today’s OEM engineers. Once the finished product is shipped to the customer, the customer must
properly maintain the bearing assembly or deal with the potential for failure, and whatever liability
or warranty claims may come from that. If proper maintenance is a concern, the best solution is a
self-lubricating composite bearing. Self-lubrication is the ideal solution since it fully lubricates the
contact surfaces, does not attract dust or dirt (as both grease and oil will), results in no environmental problems as grease or oil can, and requires absolutely no field or long term maintenance.
“One of the most common
failures for bearing design
is when lubrication is not
properly maintained.
PolyLube bearings eliminate
lubrication maintenance.”
WHEN TO USE POLYLUBE™ BEARINGS
• When self-lubrication is required.
• When bearing neglect could lead to product liability claims or premature failure.
• When conventional lubricants will not function or cannot be used (as in the food processing and
pharmaceutical industries).
• When bearing, lubrication system, and maintenance costs need to be closely monitored.
• When wide temperature ranges, particularly at low temperatures, require bearing performance
stability.
• When stick-slip conditions exist.
• When high load capacities are needed.
• When resistance to chemical, galvanic, or fretting related corrosion is a problem.
• When weight reduction is desired.
• When galling and scoring need to be minimized.
• When shock loads present a problem.
• When electrical insulation is required.
COMPOSITE BEARINGS ARE SIMPLY BETTER
It is a design reality that today’s OEM engineering community has many bearing alternatives to
choose from. When making a design decision, it can be difficult to weigh through performance differences between materials, and come to a conclusion that optimizes your design. In the following
pages, a basic application-driven discussion is presented between composite bearings and traditional metallic or thermoplastic bearings.
★
7
★
Hex ID and special ID shapes can be incorporated into the bearing as well.
Polygon’s CNC fabrication equipment allows for
special designs to be economically incorporated.
HIGHLIGHTS
INTRODUCTION
GREASED BEARINGS
The most obvious difference? This family of bearing materials requires perpetual greasing. When
the lubricating film fails due to contamination, the bearing will prematurely wear. Performance of
this bearing is entirely reliant on the end user properly maintaining and servicing the bearing
joint in question.
MATERIAL
When grease fails these bearings quickly
wear through and produce intimate contact
between the shaft and bearing.
★
8
★
“Performance of a greased
bearing is entirely reliant
on the end user properly
maintaining and servicing
the bearing joint”
MAX. DYNAMIC
MAXIMUM
THERMAL
CAPACITY-PSI
TEMPERATURE EXPANSION
(LESS THAN 5 SFPM)
°F
10-6 IN./IN./°F
Cast Bronze
Porous Bronze
Alloyed Bronze
Steel-Backed Bronze
Hardened Steel
Zinc Aluminum
Fabric-Reinforced Phenolic
Reinforced Teflon†
POLYLUBE Fiber Series
6,000*
4,000**
10,000*
3,500*
40,000*
5,500*
6,000*
2,000
30,000
160*
160**
200*
200*
200*
200*
200*
500
325
10
10
16
8
7
15
20
55
7
SPECIFIC
GRAVITY
8.8
7.5
8.1
8.0
7.9
5.0
1.6
2.0
1.87
*with lubrication **oil impregnated †DuPont™
ADDITIONAL PERFORMANCE DIFFERENCES:
• Loads only to 20,000 PSI with lubrication compared to PolyLube™ dynamic loads to 30,000 PSI
and static loads of 60,000 PSI without lubrication.
• Greased metal-backed bearing materials have very fine operating temperature ranges. They
traditionally span from -40 to +210°F compared to PolyLube ranges from ±325°F.
• Once mixed-mode lubrication (grease &/or oil) fail due to particulate ingestion and contamination,
this type of bearing can no longer operate successfully.
SINTERED METALLIC BEARINGS
Sintered metallic bearings have innate limitations due to their structure and to the mechanisms
by which they achieve lubrication. The structure of a sintered material bearing dramatically reduces impact or shock loading capability as well as limits both the static and dynamic loading capacities when compared to PolyLube bearing materials.
Sintered structure bearings can’t handle the
load of composite bearings.
• At best, dynamic capacities of 8,000 PSI.
• Alloyed bronze bearings have the highest dynamic capacity within
this family-and that is 10,000 PSI or less than 5 SFM with lubrication.
Filled thermoplastics have no chance
• Lowered impact or fatigue strength properties.
in highly loaded environments.
• Prone to corrosion and shaft fretting.
• Many times burnishing tools are required to get product to final geometric tolerances.
HIGHLIGHTS
INTRODUCTION
FILLED THERMOPLASTIC BEARING MATERIALS
• Sizing predictability. Due to the fact that these bearings are manufactured via injection molding,
sizing can be difficult to predict.
• Impact Fatigue. Even glass filled thermoplastic resins can only go
so far with resistance to repeated impact.
• Limited Self-Lubrication Capabilities. Lubrication for filled thermoplastics
does not utilize as significant a percentage nor as effective a type of PTFE
as do PolyLube bearing materials. As a result, the in-use coefficient of
friction and break-in characteristics of each bearing material is different.
METAL BACKED BEARINGS
“Metal backed bearings are
subject to severe corrosion—an issue that can
occur as quickly as 24
hours into basic immersion
testing”
Thermoplastics are highly subject to cold flow under loading—something PolyLube™
bearings do not struggle with.
Metal backed bearing materials have been an obvious choice for design engineers given their feature/benefit combination in association with product price. With recent developments in manufacturing techniques, Polygon’s line of PolyLube™ bearings are attaining market penetration
against this family of conventional bearing materials.
• With any metal backed bearing, once the overlay is broken into the shaft is in intimate contact
with the metal backing—this can result in premature failure.
• Dynamic capacities of this family of bearings is typically at a maximum of 20,000 PSI
compared to 30,000 PSI with a PolyLube Fiber Series bearing.
• As with any metal structure, this type of bearing is subject to severe corrosion—an issue that
can occur as quickly as 24 hours into basic immersion testing.
★
9
★
Once the overlay is worn through, intimate
contact and failure can quickly result.
ROLLING ELEMENT BEARINGS
PolyLube™ bearings are able to handle higher load capacities, and in particular shock loading,
than traditional rolling element bearings.
• Reduce the weight and profile of the bearing—in many cases the weight and profile of the bearing
can be reduced by over 50%.
• The PolyLube bearing family exhibits much higher static load capacities than traditional rolling
element bearings—an equivalent sized needle bearing will only have 30% of the static capacity
of a composite PolyLube bearing.
• No external lubrication is required with the PolyLube bearing—there are no concerns with failed
lubrication media resulting in shaft damage.
• By using the PTFE film transfer process instead of macro mechanical moving parts, the PolyLube
family of bearing materials is able to have more predictable performance stability over the
life of the application.
FIBER SERIES BEARINGS
HIGHLIGHTS
Product Description
FIBER SERIES
BEARINGS
The PolyLube Fiber Series bearing is a high load,
low RPM bearing designed for rigorous industrial
equipment applications. The bearing is manufactured by a filament winding process that results in a
continuous fiberglass filament backing compositionensuring excellent mechanical properties (especially
fatigue resistance). The filament wound fiberglass
structure uses a high strength, corrosion resistant
epoxy resin as the matrix material. The high strength
backing permits the use of a thin wall (1/16" to 1/8")
bearing which can often reduce the size and weight of
the finished bearing assembly. PolyLube Fiber Series
bearings will support a bearing load of 30,000 PSI,
while handling high radial and axial stresses. They resist high shock loading and impact fatigue due to their
unique high strength continuous fiberglass backing.
These qualities make PolyLube bearings ideal for high
load operation in rotational and linear movements as
well as in oscillation. This family of materials exhibits
exceptional dimensional stability and performance
predictability over wide temperature ranges (±325°F).
“PolyLube™ Fiber Series
Bearings are the ideal
candidate bearing material
for highly loaded bearing
joints requiring long term,
trouble free maintenance.”
★
10
★
PTFE WITH WEAR
RESISTANT MATERIAL
WEAVE
EXPOSED PTFE
REDUCES FRICTION
HIGH STRENGTH
COMPOSITE FIBERGLASS
EPOXY BACKING
WEAR RESISTANT DEBRIS
LAYS IN VOIDS
Product Schematic
The high strength composite fiberglass backing permits optimal strength and rigidity, with a modulus
of elasticity of approximately 6 x 106 PSI. This property allows the PolyLube bearing to be rigid enough
to support heavy loads and pliant enough to tolerate moderate shaft
COEFFICIENT OF FRICTION FOR A POLYLUBE FIBER BEARING misalignments without over-stressing the bearing edges.
0.275
The bearing surface is composed of a uniquely designed woven structure of PTFE super-filaments, which exhibit tensile strengths twenty
times greater than PTFE resins. As a result, the bearing is not subject to
cold flow under high loading conditions. These PTFE super-filaments
are also the primary mechanism for allowing the PolyLube product to
operate in a true self-lubricating mode. No secondary lubrication is
necessary, even during start-up conditions, due to the film transfer
self-lubrication process.
COEFFICIENT OF FRICTION
0.250
0.225
0.200
0.175
0.150
0.125
0.100
0.075
0.050
0.025
0
2
4
6
8
10
12
14
16
18
20
RADIAL LOADING PRESSURE (PSI x 103)
22
As the bearing joint begins service, the PTFE undergoes a phase
change and smears around the mating pin surface. As the PTFE film
develops, it transfers from the inner diameter to the outer diameter of
the pin, smoothing out any macroscopic surface imperfections and allowing the bearing to have a very low coefficient of friction and minimal long term wear, even under high loading conditions.
HIGHLIGHTS
NEW
BEARING
FIBERGLASS BACKING
BREAK-IN
MATERIAL
TOP OF
RESIN
FLAKES
TOP OF
WEAVE
PTFE WEAVE
PTFE WEAVE
STABILIZED
BEARING
FIBERGLASS BACKING
As the bearing begins to cycle, the initial coefficient of friction will increase in
relationship to the longer term, “broken-in” frictional values. This is due to the
fact that a small layer of resin, generated by the manufacturing process of the
composite backing, is being slowly worn away.
In some conditions, as much as
0.001" of wear may occur during the
break-in period, while in other operations, break-in wear may be negligible. The elapsed time for break-in is
PV (Pressure and Velocity) dependent. The equilibrium wear rate varies
from operation to operation, due to a
number of factors including: loads,
speeds, shaft hardness, material, and
shaft surface finish. For more specific
guidance on the break-in period to
anticipate given your specific application, please contact a PolyLube application engineer.
“PolyLube Fiber Series
bearings will support
a dynamic bearing load
of 30,000 PSI”
Following the break-in period, the wear rate stabilizes, remaining relatively constant for the bearings’
life. Testing of the Fiber Series Bearing at 22,500 pounds, with 50° oscillation angle, resulted in stable
wear under 0.005" at over 1.5 million cycles.
PolyLube Fiber Series bearings are designed to minimize wear; however, the bearing wear is effected by the general operating conditions, such as speed, sliding distance and load. With intermittent rotation or oscillation, radial wear should be negligible over thousands of hours. Hard
chrome plating gives excellent wear performance and protects the shaft from corrosion. Coatings
such as chrome, electroless nickel, or nitro carbonizing are all common treatments for shaft materials used with PolyLube bearings.
★
11
★
PTFE Film Transfer Process
Before Film Transfer Process
PTFE Film
After Film Transfer Process
The above schematic represents a detailed
perspective on how the surface condition of
the mating pin changes both before and after
the PTFE film transfer process.
HIGHLIGHTS
FIBER SERIES
BEARINGS
MECHANICAL AND PHYSICAL PROPERTIES
The PolyLube Fiber Series bearing can withstand static loads of approximately 60,000 PSI and
30,000 PSI under dynamic loading. At these loading levels, minimum distortion will occur. For
dry running applications, the maximum speed is approximately 10 surface feet per minute.
This bearing’s operating temperature range is ±325°F. Maximum continuous operational surface
temperature for the standard formulation is 325°F, depending upon load characteristics. The bearing has been heat stabilized at these temperatures, so that little dimensional change will occur in
the bearing during operation. In a free state, the coefficient of expansion of the PolyLube Fiber Series bearing is approximately 7 x 10-6 in/in/°F, similar to the coefficient of expansion for steel, and
actually less than some metals.
Ultimate Compression Strength (PSI)
60,000
Unit Load Limit (PSI)
30,000
Temperature Range (Standard Formulation)*
±325°F
Coefficient Of Thermal Expansion (in/in/°F)
7 x 10-6
Thermal Conductivity (BTU • in/(hr • Ft2 • °F))
1.8-2.3
Water Absorption (2 Hours)
0.12%
★
0.16%
★
Specific Gravity
1.87
Maximum Velocity (SFM)
10
12
*Note: Special resin formulation available up to 500°F.
APPLICATIONS
“With intermittent
rotation, radial wear
should be negligible over
thousands of hours.”
PolyLube Fiber Series bearings are the bearing of choice in
highly loaded bearing joints where a life cycle of over
500,000 cycles is desired. Testing has shown this bearing
has wear under 0.006" after 1.6 million cycles. Applications
include material handling equipment, high duty cranes,
earth-moving equipment, construction equipment, agriculture equipment and food processing systems.
HIGHLIGHTS
MRP AND MRP-SL BEARING
PRODUCT HISTORY
From a pure load carrying and performance perspective Polygon’s
Fiber, MRP and MRP-SL series bushings are practically identical. Our
desire has not to only be the industry leader in performance, but in
cost as well. A through analysis and value stream mapping of the
manufacturing process resulted in the development of the MRP and
MRP-SL product. Essentially a bushing family of equal performance,
but at a lower price point.
PRODUCT DESCRIPTION
“These issues come together
to allow Polygon to sell
a product better matched to
customers’ needs.”
The MRP and MRP-SL are identical in liner architecture components
and construction. The MRP-SL has one unique and added lubricant embedded within the surface of the liner material to decrease the initial
coefficient of friction. This small change was initiated because in certain lightly loaded joints, upon initial actuation, an intermittent stickslip or noise could be generated. The MRP-SL addresses this issue by
decreasing friction and reducing the typical break in period.
★
13
★
CALCULATED INITIAL COF FOR POLYLUBE MRP BUSHINGS
4140 Nitrided Shafts
0.35
STATIC COF
COEFFICIENT OF FRICTION
0.30
DYNAMIC COF
0.25
0.20
0.15
0.10
0.05
0.00
MRP 13 Ra
MRP 13 Ra
MRP 65 Ra
MRP-SL 65 Ra
MRP-SL 13 Ra
MRP-SL 13 Ra
PIN SURFACE FINISH
MRP AND MRP-SL BEARING
HIGHLIGHTS
PRODUCT DESCRIPTION (CONTINUED)
PolyLube MRP bearings are designed to minimize wear; however, the bearing wear is effected by the
general operating conditions, such as speed, sliding distance and load. With intermittent rotation or
oscillation, radial wear should be negligible over thousands of hours. Hard chrome plating gives excellent wear performance and protects the shaft from corrosion. Softer coatings such as cadmium
or zinc may wear off more quickly and may not stand up to the desired service requirements.
The PolyLube MRP bearing can withstand static loads of approximately 60,000 PSI and 30,000
PSI under dynamic loading. At these loading levels, minimum distortion will occur. For dry running
applications, the maximum speed is approximately 10 surface feet per minute.
the bearing during operation. In a free state, the coefficient of expansion of the PolyLube MRP
bearing is approximately 7 x 10-6 in/in/°F, similar to the coefficient of expansion for steel, and actually less than some metals.
★
14
★
“With intermittent
rotation, radial wear
should be negligible over
thousands of hours.”
APPLICATIONS
PolyLube MRP bearings are the bearing of choice in highly
loaded bearing joints where a life cycle of over 500,000 cycles
is desired. Testing has shown this bearing has wear under
0.006" after 1.6 million cycles. Applications include material
handling equipment, high duty cranes, earth-moving equipment, construction equipment, agriculture equipment and food
processing systems.
60,000
30,000
Temperature Range (Standard Formulation)*
±325°F
7 x 10-6
1.8-2.3
0.12%
0.16%
Specific Gravity
1.87
10
*Note: Special resin formulation available up to 500°F.
HIGHLIGHTS
GLASS TAPE BEARING
PRODUCT DESCRIPTION
The PolyLube Glass Tape bearing is a moderate RPM bearing designed for applications with higher
surface velocities or when mixed film conditions are desired.
Similar to the Fiber Series bearing, the Glass Tape bearing is manufactured by a filament winding
process that results in a continuous fiberglass filament backing composition-ensuring excellent
mechanical properties (especially fatigue resistance) are attained. The filament wound fiberglass
structure uses a high strength, corrosion resistant epoxy resin as the matrix material. The high
strength backing permits the use of a thin wall (1/16" to 1/8") bearing which can often reduce the
size and weight of the finished bearing assembly. PolyLube Glass Tape bearings will
support a dynamic bearing load of 7,000 PSI,
while handling high radial and longitudinal
stresses with a static bearing capacity of
40,000 PSI. This family of materials exhibits
exceptional dimensional stability and performance predictability over wide temperature ranges (±325°F).
“The Glass Tape bearing
has a lower coefficient of
friction and will handle
higher surface velocities
than the Fiber Series.”
★
PRODUCT SCHEMATIC
The PolyLube Glass Tape lined bearing is similar in backing construction
when compared to its sister product-the Fiber Series bearing; however, the
difference in the construction of the liner material drives the variations in
performance. The primary performance variations between the Glass Tape
and the Fiber Series bearing are that the Glass Tape bearing has a lower coefficient of friction and will handle higher surface velocities. However, the
Glass Tape bearing sacrifices some capabilities with a slightly lower dynamic and static load capacity.
These differences are driven from fact that the Glass Tape bearing uses a
proprietary filled PTFE resin structure as opposed to the continuous PTFE
filaments used in the Fiber Series product. Two liner thicknesses are available with the 0.015" thick liner being standard and a 0.030" thick liner
being available for unique applications. The 0.030" thick liner is designed
for applications where boring the inner diameter might be required in order
to achieve tighter tolerances in an effort to address sizing and minor misalignment conditions.
15
★
HIGHLIGHTS
GLASS TAPE BEARING
The PolyLube Glass Tape bearing can withstand static loads of approximately 60,000 PSI and
7,000 PSI under dynamic loading. At these loading levels, minimum distortion will occur. For dry
running applications, the maximum speed is approximately 80 surface feet per minute.
COMPARATIVE PV and COEFFICIENT OF FRICTION TEST RESULTS
Testing performed independently at Rensselaer Department of Mechanical Engineering
★
16
AVG. COEFFICIENT OF FRICTION
RESULTS FOR VARIOUS BEARINGS TESTED BY RENSSELAER
P=200 psi (constant)
0.25
0.20
0.15
0.10
0.05
0.00
★
Metal Backed
Bearing
Legacy Era
FW Bearing
PolyLube
Fiber Bearing
PolyLube Bronze
Tape Bearing
PolyLube Glass
Tape Bearing
BEARING MANUFACTURER AND TYPE
RESULTS FOR VARIOUS BEARINGS TESTED BY RENSSELAER
P=200 psi (constant)
AVERAGE PV LIMIT
80,000
60,000
40,000
20,000
0.00
Metal Backed
Bearing
Legacy Era
FW Bearing
PolyLube
Fiber Bearing
PolyLube Bronze
Tape Bearing
PolyLube Glass
Tape Bearing
BEARING MANUFACTURER AND TYPE
HIGHLIGHTS
GLASS TAPE BEARING
MECHANICAL AND PHYSICAL PROPERTIES (CONTINUED)
the bearing during operation. In a free state, the coefficient of expansion of the PolyLube Glass
Tape bearing is approximately 7 x 10-6 in/in/°F, similar to the coefficient of expansion for steel,
and actually less than some metals.
POLYLUBE GLASS TAPE BEARING
APPLICATIONS
Applications for PolyLube Glass Tape Bearings range
from guide rod bushings to linear motion components to hydraulic pumps. Swashblock mounted
bearings are ideal applications for the Glass Tape
bearing material as long as application considerations are consistent with a mixed film condition.
The PolyLube bearing offers a more elastic, damage
tolerant structure when compared to traditional
metallic bearing materials. In addition, the Glass
Tape bearing exhibits good cavitation resistance
when subjected to high pressure fluids during
cyclic conditions.
60,000
7,000
Temperature Range (Standard Formulation)
±325°F
Coefficient Of thermal Expansion (in/in/°F)
7 x 10-6
1.8-2.3
0.12%
0.16%
Specific Gravity
1.95
80
★
DESIGNING AROUND STICK-SLIP (STICK-TION) WITH
POLYLUBE GLASS TAPE BEARINGS
Stick-slip, commonly referred to as stick-tion, is a phenomena many OEM’s experience when designing with self-lubricated bearings. This condition can be alleviated through a design change
from the PolyLube Fiber bearing to a PolyLube Tape bearing material.
Stick-Slip in self-lubricated bearing can be attributed to a number of factors that all have a direct
relation to the coefficient of friction between the bearing liner and the shaft. Among these factors
is the surface finish of the shaft, the pressure exerted on the bearing, the type and structure of
the bearing liner in use, and any contamination present on the interface between bearing and pin.
The attributes of the bearing liner itself also contribute significantly to the stick-slip condition.
Two of these attributes include the presence of a solid lubricant in the resin (MoS2, Graphite,
etc.), and the amount of resin present at the surface that must be worn through in order to have
intimate contact between the PTFE in the bearing liner and the pin itself.
★
17
“The PolyLube bearing
offers a more elastic,
damage tolerant structure
when compared to traditional metallic bearing
materials.”
GLASS TAPE BEARING
HIGHLIGHTS
POLYLUBE GLASS TAPE BEARINGS (CONTINUED)
“Applications sensitive to
stick-slip that exert
pressures below 3,000 psi
should use a filled PTFE
Tape Liner.”
★
18
★
The surface finish of the shaft relates directly to
the coefficient of friction at the interface between
the shaft and the bearing. Polygon recommends a
PTFE WITH WEAR
RESISTANT MATERIAL
shaft with a surface finish between 16 and 32 Ra.
WEAVE
In applications where stick-slip is especially sensitive, a shaft with a surface finish approaching
16 Ra should be used. This will be extremely imEXPOSED PTFE
REDUCES FRICTION
portant when the Fiber liner is used with pressures less than 6,000 psi. The reduced surface
finish relates to the depth the peaks on the surface of the shaft embed into the bearing liner. A
HIGH STRENGTH
COMPOSITE FIBERGLASS
rougher surface finish will force larger peaks of
EPOXY BACKING
the shaft to be dragged through the liner. This
causes the breakaway friction to be increased iniWEAR RESISTANT DEBRIS
LAYS IN VOIDS
tially. Using the PolyLube Fiber liner at pressures
greater than 6,000 psi will force both the shearing of the peaks and the filling of the valleys with
PTFE to occur significantly faster due to the increased shear stress. The PolyLube Tape liner will
not be as sensitive to surface finish due to the softness of the liner in contrast to the standard
Fiber liner. The tape will fill in the valleys on the surface to build up the shaft surface as opposed
to shearing the surface down slightly.
The pressure exerted on the bearing is inversely proportional to the coefficient of friction between
the bearing surface and the shaft. As the load is increased, the coefficient of friction decreases.
This is due to the properties of the PTFE contained in the liner. Applications that exert a pressure
above 6,000 psi will usually not experience the stick-slip problems when using the Fiber liner. Applications sensitive to stick-slip that exert pressures below 3,000 psi should use a filled PTFE
Tape liner. This suggests that if the pressure exerted on the bearing is between 3,000 and 6,000
psi, the bearing length should be adjusted to achieve the proper pressures.
Some applications will generate a noise problem which is the result of a non-optimized design relationship between the type of bearing liner, PV and pin conditions. Noise is a symptom of coefficient of friction being amplified through the entire bearing assembly. A PolyLube Fiber liner can
generate noise due to the interaction of all of the above variables. One design option is to lengthen
the bearing to bring the pressure down to approximately 4,000 psi. Such a modification will allow
Polygon to specify the tape liner. Most times, the noise problem can be solved as a result of the
drop in the coefficient of friction.
HIGHLIGHTS
GLASS TAPE BEARING
POLYLUBE GLASS TAPE BEARINGS (CONTINUED)
The differences between the PolyLube Fiber and Tape liners are primarily load capacity and frictional response. Under start-up conditions, the coefficient of friction of the tape liner is significantly lower. This is a result of the compositional and structural differences between the two
liners. The tape bearings use a liner that is a filled PTFE tape that creates a PTFE rich wear surface
immediately. The Fiber liner uses a uniquely designed and proprietary woven architecture of hightenacity PTFE monofilaments that are capable of handling higher pressures but has an epoxy
resin that migrates to the surface as a result of the manufacturing process. The epoxy resin present at the surface will increase the coefficient of friction to about 0.2. The elevated coefficient of
friction of the Fiber liner with respect to the tape liner is not solely based on this difference.
“Under start-up conditions, the coefficient of
friction of the tape liner
is significantly lower.”
Polygon has the ability to hone the Tape liners if required for unique applications. This honing feature allows the Tape lined bearings to have a coefficient of friction that is about 0.1 during startup conditions. The trade-off for this low coefficient of friction is load capacity. Polygon has rated
the Tape bearing to have a maximum operating pressure of 4,000 psi. In comparison, the PolyLube
Fiber lined bearings can operate as high as 20,000 psi (design thresh-hold).
The presence of solid lubricants alone does not solve the whole stick-slip
problem. Such a design concept is similar to an initial greasing with a
greased bearing. Greasing will simply prolong the break-in process until
the lubricant is used up or pushed out. Noise can develop after the lubricated layer of resin was penetrated and the PTFE fiber wear surface was in
intimate contact with the pin. The noise phenomenon is due to the abrasive nature of the PTFE filaments.
The designed pressures and the choice of liners are critical in applications
that have an increased sensitivity to stick-slip. The major design criteria
would be to use the Tape liner if a bearing can be used that will keep the
pressures to 4,000 psi or below. If the pressures must be designed higher
than 4,000 psi, a bearing length should be used to keep the pressures
above 6,000 psi. This will enable the Fiber bearing to be used with a
greater probability of success as it relates to stick-slip.
TAPETAPE
(BRONZE)
BEARING
GLASS
BEARING
★
19
★
PTFE
BRONZE
GLASS
PARTICLES
FILAMENTS
DRY LUBRICANT
FILLERS
HIGHLIGHTS
IFR BEARING
PRODUCT DESCRIPTION
The PolyLube IFR bearing offers the same inherent
anti-friction components that allow it to achieve the
low wear characteristics of the Fiber and MRP series
bearings. However, in comparison to these two products, the IFR bearing (for Improved Fatigue Resistance) offers a proprietary laminate structure of the
bearing backing that increases the bearing’s resistance to repeated stress/strain conditions.
“The PolyLube IFR bearing
offers a proprietary structure that improves resistance to fatigue failure.”
A low friction, self-lubricating composite bearing with
significantly improved fatigue resistance against repeated stress/strain conditions.
Several years ago, Polygon Company was approached with a seemingly straight-forward application for traditional filament wound composite bushings. At issue was an application that was resulting in bearing failure after just 10,000 oscillatory cycles. The pressure on the bearing was
well under the design threshold (actual applied pressure to the bearing was 10,000 PSI). In response to this customer’s demand, Polygon Company developed an improved impact fatigue
bearing that in the case of the above application, increased the life of the bearing by over 50%.
★
MODULUS OF ELASTICITY AT VARIOUS WIND ANGLES
5
4
Ex Msi
Ey Msi
Gxy Msi
3
2
Traditional
Wind Angle
1
PolyLube
High Strength
Wind Angle
20
40
60
80
100
WIND ANGLE
PRODUCT SCHEMATIC
Traditional filament wound composite bearings will tend to show fatigue failure in the form
of resin shear failure in the traverse direction to the reinforcing fibers. The logical solution
to this problem was to try to cross-tie the reinforcing fibers together with other reinforcing
fibers so as to minimize the shear stresses in the resin.
160
Because composite filament wound bearings are not isotropic
materials as are metals, Polygon Company’s FEA laminate
analysis focused on what was believed to be the limiting factor:
optimization of system’s interlaminar shear. The PolyLube IFR
bearing offers a more than twofold increase in the impact fatigue over traditional composite bearing materials.
PRODUCT ADVANTAGES
The PolyLube IFR bearing is the first bearing with such an optimized resin system and fiber/laminate architecture.
α = WIND ANGLE
STRENGTH PROPERTIES AT VARIOUS WIND ANGLES
140
STRENGTH (ksi)
★
20
ELASTIC MODULUS (Msi)
6
120
FxT
FyT
FxC
FyC
Fxy
100
80
ksi
ksi
ksi
ksi
ksi
CONTINUOUS FIBERGLASS
FILAMENT WINDING
60
Traditional
Wind Angle
40
PolyLube
High Strength
Wind Angle
20
20
40
60
80
100
WIND ANGLE
HIGHLIGHTS
IFR BEARING
The PolyLube IFR bearing can withstand static loads of approximately 60,000 PSI and 30,000 PSI
under dynamic loading. At these loading levels, minimum distortion will occur. For dry running applications, the maximum speed is approximately 10 surface feet per minute.
the bearing during operation. In a free state, the coefficient of expansion of the PolyLube IFR bearing is approximately 7 x 106 in/in/°F, similar to the coefficient of expansion for steel, and actually
less than some metals.
MECHANICAL
PROPERTIES
POLYLUBE FIBER OR
MRP SERIES BEARING
POLYLUBE IFR
BEARING
Ex(axial), Msi
1.3
1.6
Ex(hoop), Msi
3.2
2.4
Gxy, Msi
1.0
1.0
Tx(tensile), Ksi
5.5
11.9
Tx Ksi
64.5
48.7
Cx(compression), Ksi
18.8
20.0
V-xy(Poisson’s Ratio)
.314
.312
V-yx
.762
.435
This picture represents the initial “on-set” condition commonly related to fatigue failure due
to repeated impulse loading of the bushing.
Composite bearings that do not have an optimized resin system and laminate architecture
will be very susceptible to this type of failure.
POLYLUBE IFR BEARING APPLICATIONS
Excellent applications for IFR bushings include bearing systems using alloyed bronze, springretained, hardened bushings and hardened steel bearings.
★
21
★
HIGHLIGHTS
HIGH TEMPERATURE BEARING
PRODUCT DESCRIPTION
“The PolyLube HT bearing
can offer performance
enhancements over greased
systems, as well as polysulfone, PEEK, and polymide
bearing materials.”
★
22
The PolyLube HT bearing is a high load, low RPM bearing designed for applications where self-lubrication is desired, but
conventional composite bearings will not perform at high
temperatures. This product has been designed to provide
excellent performance at elevated temperatures. With a
glass transition temperature of over 450ºF this epoxy filament wound structure exhibits superb performance over
extended exposure to elevated temperatures. The bearing
material is focused on applications where the bearing will
be exposed to temperatures up to 450ºF.
In addition to its high compressive properties (in both static and dynamic modes), this bearing
material is inherently self-lubricating. The self-lubrication capability of Polygon’s new material
means that the use of expensive high temperature external lubricants such as polyurea grease,
lithium grease, some bentone greases, as well as advanced ester based oils and complex thickening systems may no longer be necessary.
The PolyLube HT bearing creates a high strength, self-lubricating journal bearing material that can
offer performance enhancements over greased systems, as well as graphite loaded bronze structures, some iron-copper graphites, polysulfone, PEEK, and polymide bearing materials.
★
PRODUCT SCHEMATIC
This bearing is based on the same filament wound structure as the PolyLube Fiber Series bearing
and has the same wear liner. The result is that the HT bearing has a high static and dynamic load
capacity. The HT bearing is also inherently self-lubricating through the same film transfer process
as the Fiber Series bearing.
The result of a higher temperature
resin matrix, the same high strength
filament wound backing, and the same
self-lubrication process combine to
make the HT bearing an ideal solution
for high temperature applications.
The PolyLube High Temperature bearing was originated from development
work the company was doing on high temperature, high RPM, high radially
stressed composite materials for ring reinforced commutators. The end was
replacing steel-mica rings with a high strength composite material.
HIGHLIGHTS
HIGH TEMPERATURE BEARING
PHYSICAL PROPERTIES**
Hoop Strength (Fy x 103)
120
Tensile Strength (Ft x 103 PSI)
20
Flexural Strength, Axial (Fbx x 103 PSI)
20
Poisson’s Ratio, Axial
0.08
Shear Modulus (Gxy x 106 PSI)
0.6
Elastic Modulus (Ex x 106 PSI)
0.6
Elastic Modulus, Transverse (Ey x 106 PSI)
5.0
60,000
30,000
Temperature Range
±200°C
0.12%
0.16%
Specific Gravity
1.87
10
**Note: These are typical properties. Specific properties may vary, depending on the composite design for each application.
APPLICATIONS
PolyLube High Temperature applications are not just
for elevated temperature environments but also for
applications where the bearing may need to resist
thermal expansion during operation. One example of
this is in snowmobile clutch markets. In these applications, the clutch speed goes from 0 to very high
RPM’s in micro-seconds (and vice versa). During this
cycling, friction is rising because speed is being dramatically increased. As the friction goes up so does
the temperature of the associated components. A
high temperature composite bearing material can resist these expansion phenomena and as a result
offer better long term wear, improved bearing durability, and less seizure opportunity than conventional
metal bearing materials.
ELECTRICAL PROPERTIES**
Insulation Resistance (ohm/8" length)
2.38 x 1012
Volume Resistivity (ohm/cm)
2.41 x 1015
Surface Resistivity (ohms)
2.92 x 1015
Dielectric Strength, Short Time (volts/mil)Minimum
100
Dielectric Constant (60 cps)
4.15
Dissipation Factor (60 cps)
0.0094
Impulse (11/2 40u Wave (Axial) volts/mil)
400 to 550
Power Factor @ 60 cps (100v pct mx)
As Received
5.0
@100ºC
10.0
After 24 hours @100ºF @ 98% rel. hum.
10.0
THERMAL PROPERTIES**
Thermal Conductivity (BTU/hr/sq ft/ºF/in)
1.8 to 2.3
Specific Heat (BTU/lb/ºF)
0.27
Coefficient of Thermal Expansion (in/in/ºF)
5.0 to 7 x 106
Heat Resistance, Continuous
±200ºC
★
23
★
HIGHLIGHTS
GUIDE ROD BUSHING
PRODUCT DESCRIPTION
“PolyLube Guide Rod
Bushings offer improved
stick-slip properties and
a reduction in shaft
scoring.”
PolyLube Guide Rod Bushings are designed as replacements for traditional
metallic guide rod bushing materials. Replacing conventional metallic guide rod
bushings with a PolyLube guide rod bushing is a straight-forward change out. Typical replacement programs where metallic
guide rod bushings are replaced are
driven from one or a combination of several of the following factors.
PolyLube Guide Rod Bushings are commonly available in two formats: a PolyLube bushing utilizing a sintered PTFE liner or a PolyLube bushing utilizing a PTFE fabric liner. The most common
PolyLube guide rod bushing in use today is the sintered PTFE liner due to two primary performance enhancements over the PTFE fabric lined bushing: the frictional response under start-up
conditions and the transfer of PTFE to the wear surface.
COMPARISONS TO COMMON GUIDE ROD BUSHING MATERIALS
★
24
★
SINTERED (PM) STRUCTURE BRONZE
Sintered powder metal (PM) structure bushings rely on an internal lubricant that is entrapped
into the metallic structure as it undergoes the sintering process. As the bushing is cycled the lubricant migrates to the wear surface both as a natural function of relieved internal bushing stress
which allows the lubricant to flow to the area of bushing wear, but also as the bushing itself is
worn away and the lubricant finds itself in contact with the
pin material. Several problems exist for this type of bushing
REASONS TO DESIGN WITH POLYLUBE GUIDE ROD BUSHINGS:
material.
• Improved stick-slip properties
• Optimal frictional response during cycling
• Significant reduction in shaft scoring
• Extension in the bushing life
• Reduction in bushing profile
• Greatly improved side load/misalignment capacity
• Increase in load capacity of bushing
• Enhanced corrosion resistance
• Tolerance of more cost effective shaft finishes
• Lower in weight
First, these bushings have a poor load capacity in either dynamic or static conditions. In linear slide block applications,
this load capacity can become increasingly problematic. As
the load on the bushing assembly increases, the bushings
will wear to accommodate the emerging load pattern during
the bushing’s cycle. As this process advances, the bushing
assembly’s accommodation will translate into increased slop
in the slide block itself, and will ultimately result in a slide
block that is no longer cycling per the manufacturer’s requirements as well as causing increased seal wear from
piston misalignment.
HIGHLIGHTS
GUIDE ROD BUSHING
COMPARISONS TO COMMON GUIDE ROD BUSHING MATERIALS (CONTINUED)
Second, sinter structure bronze bushings have a lubrication mechanism that is both unreliable
and easy to deplete. This means that shaft scoring, high friction, and high wear are all anticipated
with these bushing materials. PM structure bushings must wear in order to continue to transfer
lubricant to the wear surface. In linear slide applications the surface area that must be covered
with lubricant is significantly greater than what is seen in oscillatory or rotational movement environments. As such, the frictional response and wear patterns of PM structure bushings degrade
much more rapidly than higher performance bushing materials.
METAL-BACKED
This family of bushing materials is divided into two product types: the first is true ring structure
metal backed bushings and the second is split seam journal bushings. Ring structure bushings
are expensive to manufacture given the means by which the bushing liner is inserted into the
bushing ID. The labor required to complete this process, as well as the necessary secondary labor
to manufacture the bushing to the tolerances required, result in an overly expensive bushing.
“With metal-backed journal bushings, startup running clearances change
quickly due to the thin and
soft PTFE overlay on top of
the bronze interstructure
being scrubbed off the
bushing surface.”
The second type of metal-backed bushing is the more common split seam journal bushing. This
bushing exhibits good frictional response during start up conditions but is prone to excessive
wear. The PTFE overlay is very thin (typically only 0.005") and is quickly worn away in linear motion applications where the surface area
that the PTFE must be transferred to is
fundamentally greater than the surface
area of a conventional rotational or oscillatory application. In addition, start-up
running clearances change very quickly
in metal-backed bushings due to the
thin soft PTFE overlay on top of the
bronze inter-structure being scrubbed
off of the bushing bore surface. Strict
running clearances quickly disappear
as the liner wears and tries to stabilize.
Depending upon shaft finishes, wear
simply accelerates resulting in unwanted clearances and assembly looseness. A PolyLube composite
self-lubricating bushing offers minimal
break-in and reliable self-lubrication
through application life.
★
25
★
HIGHLIGHTS
GUIDE ROD BUSHING
COMPARISONS TO COMMON GUIDE ROD BUSHING MATERIALS(CONTINUED)
THERMOPLASTIC
A common and low cost guide rod bushing material is thermoplastics. These type of bushing materials share most of the design and performance limitations that PM structure metal bushings
do because the thermoplastic bushing material itself is similar in its structure as that of a PM
metallic bushing. Thermoplastics however have two additional problems associated to linear motion environments.
First, in applications where the slide velocity is high, a thermoplastic guide rod bushing does not
tolerate the heat generated from such quick response requirements. The most common thermoplastic bushing grade materials will bind on the shaft and actually begin to break down mechanically as the bushing is cycled. The amount of lubricant and
fillers will play a dynamic role in the relationship between
mechanical and performance degradation as it relates to
velocity.
Second, thermoplastic bushing materials are prone to cold
flow. Under constant load many thermoplastic guide rod
bushings will exhibit creep. This creep will result in slop in
the bushing assembly and will negatively effect any precision the slide block is expected to maintain.
★
26
★
BLACK DEBRIS SHAFT DEPOSITION
“In applications where the
slide velocity is high, a
thermoplastic guide rod
bushing does not tolerate
the heat generated from
such quick response
requirements.”
In some linear motion application environments, a
black debris develops on the distal and proximal ends
of the shaft during normal cycling conditions. This
debris is commonly seen when a sintered PTFE lined
bushing is used.
This debris is most commonly the result of a complex
interaction between the pin material itself, the liner
selection, and the rate of deceleration of the bushing
assembly. In some linear guide applications, the
weight of the bushing assembly itself creates a
macro-mechanical edge rolling condition as the assembly decelerates. For a sintered PTFE lined bushing (not a fabric PTFE lined bushing), this
deceleration causes parts of the bushing liner to roll
as the motion reverses itself. The nature of the resin the PTFE is entrapped within can create the
potential for the resin itself to bind against the shaft. As this phenomena is repeated, the liner will
fatigue and begin to transfer macroscopic portions of the liner onto the shaft.
HIGHLIGHTS
GUIDE ROD BUSHING
BLACK DEBRIS SHAFT DEPOSITION (CONTINUED)
This debris deposition is application specific and is not seen in all application environments. In
other application environments, the black debris is seen in relation to sintered (PM) structure
bronze or brass bushings. In this case, the black discoloration is not purely a deposition of material onto the shaft, but rather a scoring effect common to ring structure bushings that have a low
tolerance for missing lubricant or contamination.
The solution to an application where liner debris is being deposited on the shaft is to alter the
bushing’s wear surface to a non-resinous and non-metallic liner. In these cases, Polygon recommends transfer to one of its PolyLube fabric lined bushings such as the PolyLube Fiber, MRP or ZSeries bushings. These bushings incorporate high tenacity PTFE filaments in their continuous
architecture. This is in contrast to PTFE resinous systems which rely on either a sintered powder
form of the PTFE polymer or to another resin (such as acetal) with PTFE fibers randomly dispersed within the resin itself.
“The solution to an application where liner debris
is being deposited on the
shaft is to alter the
bushing’s wear surface to
a non-resinous and nonmetallic liner.”
The PolyLube bushings that have high tenacity PTFE filaments in their architecture allow for the
bushing assembly to undergo aggressive deceleration conditions without depositing the PTFE or
the resin carrier medium onto the shaft. This is because the wear surface of the fabric lined bushings utilize the filaments themselves without reliance on a resinous impregnation.
★
POLYLUBE ID SEAL CONFIGURATIONS
Incorporating T-lip wiper seals, radial shaft seals, o-rings
or any other similar internal sealing system is not a problem for PolyLube Guide Rod Bushings. Polygon’s internal
fabrication capabilities allow for easy and economical incorporation of ID features required to install common
sealing systems.
Two liner thicknesses are available in the standard PolyLube PTFE tape lined bushing configuration: the 0.015"
thick liner being standard and a 0.030" thick liner also
being available for applications where seal geometry
might require the introduction of a thicker liner to accommodate a unique ID feature. The 0.030” thick liner can
also be used in applications where boring the ID might be
required in order to achieve tighter tolerances in an effort
to address sizing and minor misalignment conditions.
27
★
HIGHLIGHTS
GUIDE ROD BUSHING
POLYLUBE FABRICATION CAPABILITIES
“The high strength backing
permits the use of a thin
wall (1/16" to 1/18")
which can often reduce the
size and weight of the
finished bushing.”
One common fabrication detail seen on guide rod bushing applications deal with corner radiuses on internal and external
grooves. Because Polygon uses a diamond wheel or groove tool
to form the grooves we need to have at least a .015-.020" corner
radius. When threads are used there is usually clearance involved. When assembled with the mating part the bushing could
shift to one side or the other impacting the location of the bushing surface in relation to the piston shaft. This could have a negative impact on wear.
The only other fabrication issue commonly seen on incoming prints is a surface finish called out
on the internal diameter. This is typically related to an OEM’s historical use of machined bronze
bushings in the application. Since the bronze is machined from a solid piece or casting, the surface finish is called out since it is related to the speeds and feeds of their fabrication process. The
wear surface on PolyLube bushings is not machined so the surface finish call out can be removed
from fabrication requirements.
Polygon is capable of holding a TIR I.D. to O.D. within .002" and straight diameters to +/-.0005".
★
28
★
PolyLube Guide Rod bushings are manufactured by a filament winding process that results in a
continuous fiberglass filament backing ensuring excellent mechanical properties (especially fatigue resistance). The filament wound fiberglass structure uses a high strength, corrosion resistant epoxy resin as the matrix material. The high strength backing permits the use of a thin wall
(1/16" to 1/8") bushing which can often reduce the size and weight of the finished bushing assembly. This family of materials exhibits exceptional dimensional stability and performance predictability over wide temperature ranges (±325°F).
HIGHLIGHTS
GUIDE ROD BUSHING
MECHANICAL AND PHYSICAL PROPERTIES (CONTINUED)
This bushing’s operating temperature range is ±325°F. Maximum continuous operational surface
temperature for the standard formulation is 325°F, depending upon load characteristics. The bushing has been heat stabilized at these temperatures, so that little dimensional change will occur in
the bushing during operation. In a free state, the coefficient of expansion of the PolyLube Guide
Rod Bushing is approximately 7 x 10-6 in/in/°F, similar to the coefficient of expansion for steel,
and actually less than some metals.
POLYLUBE SINTERED PTFE LINER
40,000
7,000
±325°F
7 x 10-6
1.8-2.3
0.12%
0.16%
Specific Gravity
1.95
★
29
★
POLYLUBE PTFE FABRIC LINER
60,000
30,000
±325°F
7 x 10-6
1.8-2.3
0.12%
0.16%
Specific Gravity
1.87
HIGHLIGHTS
PV CALCULATIONS
PV (Pressure & Velocity) is the most common empirical tool to use when comparing and contrasting bearing performance. “P” is related to pressure or pounds per square inch on the projected
bearing area, while “V” is velocity in feet per minute of the wear surface. Knowing the PV limit of a
bearing, the designer can determine the loads and surface running speeds under which a bearing
can safely operate. Since heat generated by friction is one of the major causes of degradation in
liners, evaluation of the operating conditions of a fiberglass-reinforced, composite journal bearing
requires that you know the approximate temperature generated on or near the actual wear surface. The temperature rise is also dependent on the running speed and is not a linear function of
the PV product.
AS A GUIDELINE, POLYGON SPECIFIES A 20,000 PV LIMIT FOR THE POLYLUBE™ BEARINGS. TEST
RESULTS CONDUCTED AT 15,000 PV GAVE ONLY 0.002" WEAR AFTER 10 MILLION CYCLES, ±25°
OSCILLATION RUN AT 60 CPM AND 343 POUNDS RADIAL LOAD. FOR SPECIAL APPLICATIONS,
50,000 PV IS POSSIBLE.
★
30
★
CALCULATING SLEEVE BEARING
PV LIMIT
FOR A PRACTICAL ILLUSTRATION OF APPLIED AND DEFINED PV CALCULATIONS, REFERENCE
THIS ILLUSTRATION:
FORCE
EXAMPLE: .750" Shaft @200 rp
85.0 lb. total load, bearing
length .750"
SHAFT
BEARING
V = 0.262* x rpm x diameter
= 0.262 x 200 x .750 = 39.3 fpm
PRESSURE =
P = total load / projected area (A)**
FORCE
AREA
BEARING
PV = PRESSURE x VELOCITY
A = .750 (shaft) x .750 (bearing
length) = .562 in.2
P = 85.0 lbs. / .562 in.2
= 151.2 psi
SHAFT
L
AREA = L x D
FD
Ft
VELOCITY IN FEET/MIN =
FL
πD
x RPM
12
D
Additional calculations for flanged bearings & thrust washers follow:
BEARING
BEARING
PROJECTED
AREA
PROJECTED
AREA
Fd
FLANGED
BEARING
FLT
D = Flange Diameter
t = Flange Thickness
d = Bearing Inside Diameter
L = Flange Length
d
TD
Td
L
SLEAVE
BEARING
THRUST
WASHER
HIGHLIGHTS
LENGTH RATIO
Optimum performance can be achieved by specifying a length to inside diameter ratio (L/ID)
ranging from 0.5 to 2.0. Below an L/ID of 0.5, highly stressed areas at the bearing’s corner may
cause premature cracking. If the L/ID ratio is higher than 2.0, a small shaft misalignment could
cause cross-corning jamming. At this point, the unit’s radial and/or longitudinal stresses could exceed 30,000 PSI. However, bearings constructed with the proper L/ID ratio can accept misalignment and shock loads without premature failure.
“Many applications undergo regular stressing of
the bearing corners due to
a misalignment condition.”
MISALIGNMENT CONDITIONS
Many applications undergo regular stressing of the bearing corners due to a misalignment condition. Should that condition be irregular, the existing PolyLube™ series bearings are acceptable. It is
important; however, to understand how misalignment impacts bearing performance and what
conditions are identified and analyzed by Polygon’s PolyLube application engineers. Misalignment
conditions create a non-linear pressure area and significantly increase the edge stresses on the
bearing. As a result, premature fatigue cracking can occur. The schematic below illustrates both
conditions. For PolyLube bearings, concerns with edge stress and fatigue cracking become acute
as the effective misalignment increases to 0.015 in/in. Beyond that level, a different backing construction can be used to increase the bearing’s resistance to impact and resulting fatigue.
★
SHAFT
ANGLE
SHAFT
ANGLE
A
BEARING
B
31
★
A
B
BEARING
A
A
B
B
LINEAR
PRESSURE
AREA
PARABOLIC
PRESSURE
AREA
Parabolic pressure
areas are indicative
of a gross misalignment condition.
Linear pressure areas
are indicative of a slight
misalignment condition.
B-B PRESSURE
B-B PRESSURE
A-A PRESSURE
A-A PRESSURE
Properly designed composite bearings can accommodate edge loading
above other bearing materials. As a result of the high strength but elastic
fiberglass backing, PolyLube bearings can handle up to a 0°-51' -34" angle
misalignment.
ANGLE
EFFECTIVE MISALIGNMENT
0° - 13' - 45" ............................0.004 in./in.
0° - 20' - 38" ............................0.006 in./in.
0° - 34' - 23" ............................0.010 in./in.
0° - 51' - 34" ............................0.015 in./in.
DESIGNING FOR EDGE LOADING
α = WIND ANGLE
As with liner construction, in order to optimize a
composite bearing’s impact resistance, the bearing must also take advantage of the performance
drivers that are related to the wind angle of the
fiberglass backing. The fiberglass backing’s orienCONTINUOUS FIBERGLASS
FILAMENT WINDING
tation off of the neutral axis is a significant driver
in the finished performance of the bearing itself. Most composite bearing companies utilize winding equipment that produces bearings between a 40 and 55 degree wind angle. For most applications this is acceptable; however, for applications where repeated high stress/strain is of concern,
the backing can be further optimized by positioning the wind angle closer to a theoretical 90 degree wind angle. This type of performance optimization is what Polygon does that other companies do not. Our manufacturing equipment is all precisely computer controlled and as a result,
wind angles can be modified to accommodate higher impact resistance.
6
ELASTIC MODULUS (Msi)
The result of an ability to optimize performance is that conditions of high edge loading
can be better controlled and designed around
by utilizing Polygon’s design skill. This allows
for a direct translation between theoretical
laminate theory, the manufacturing process itself, and the performance of your product.
HIGHLIGHTS
★
32
★
MODULUS OF ELASTICITY AT VARIOUS WIND ANGLES
5
4
Ex Msi
Ey Msi
Gxy Msi
3
2
Traditional
Wind Angle
1
PolyLube
High Strength
Wind Angle
20
“For further information
on impact fatigue and the
technical bulletin on liner
construction contact a
PolyLube product engineer.”
40
60
80
100
WIND ANGLE
160
STRENGTH PROPERTIES AT VARIOUS WIND ANGLES
STRENGTH (ksi)
140
120
FxT
FyT
FxC
FyC
Fxy
100
80
ksi
ksi
ksi
ksi
ksi
60
Traditional
Wind Angle
40
PolyLube
High Strength
Wind Angle
20
20
40
60
80
100
WIND ANGLE
HIGHLIGHTS
LOAD CAPACITY
Polygon’s proprietary process of fiberglass filament winding results in exceptionally strong structures that can support the bearing surface more than adequately. Loading in excess of 30,000
PSI can be tolerated in many situations, provided the design and the conditions of service are
fully outlined and analyzed by a Polygon bearing specialist. Fatigue is not a limiting factor in the
use of PolyLube bearings. Frequent laboratory tests have shown that the bearing is often more fatigue-resistant than the shaft.
BEARING WEAR
During the initial break-in period of a
PolyLube bearing, a transfer film is
created on the mating surface. In
some operations, as much as 0.001"
of wear may occur during this period,
while in other operations, break-in
wear may be negligible. For more detail on the break-in period and the
mechanism by which each bearing
achieves sufficient film transfer, refer
to the respective product inserts.
★
33
★
50
PV=11,416 CONTINUOUS ROTATION
0.0035
0.003
40
WEAR IN INCHES
STATIC RADIAL LOAD, PSI x 103
POLYGON POLYLUBE FIBER
DEFLECTION VS. LOAD
PSI
Permanent Set
Deflection
30
20
TYPICAL VALUES FOR
PGP16F24-8
(LOADING RATE, 10,000 PSI/MIN)
10
.004
.008
.012
.016
.020
.024
RADIAL DEFLECTION, INCHES
.028
0.0025
0.002
0.0015
0.001
0.0005
.032
Chart represents typical deflection and permanent set for heavy wall POLYLUBE bearings
25
50
75
100
125
150
175
200
225
250
TIME IN HOURS
ASSEMBLY
When a PolyLube™ bearing is press fit into a housing, it expands into the housing and creates a
highly loaded press fit condition. This is possible because of the elastic properties of the bearing’s
backing material. Press fits on wall thicknesses up to 1/8" have demonstrated that the close-in
ratio is one-to-one (0.001 press yields a 0.001 close in). However, press fits should be minimized, even though the tube will readily take presses of 0.004" to 0.005". The use of a standard
H7 housing bore is also recommended.
HIGHLIGHTS
ASSEMBLY (CONTINUED)
“The thinner the wall, the
greater the transfer of
heat.”
15∞-45∞
Due to thermal lag, the bearing wear surface
15∞-28∞
O.D. CHAMFER
OR BREAK CORNER
may be hotter than the adjacent housing,
(NO BURRS)
when heat is generated from running friction.
LEAD-IN
CHAMFER
As a result, the installed bearing may expand
inward, reducing the shaft clearance. For optimum performance. Polygon recommends a
BULL NOSE RADIUS
smooth, hardened steel shaft with a 16 micro
finish. However, PolyLube’s rugged bearing surface will permit use of a rougher finished shaft,
such as a standard drill rod, if the bearing to shaft clearance is increased. (See Part # listings for
recommended shaft clearances).
Shaft clearances should be increased for dry running applications with high rubbing velocities. Fluid
cooling and lubricants will reduce the operating temperatures, permitting tighter shaft clearances. Heat
transfer through the bearing wall is inversely proportional to the wall thickness. The thinner the wall,
the greater the transfer of heat. Thermal conductivity, for example, is 1.8 to 2.3 Btu • in/(hr • ft2 • °F).
Optional
O-ring for
Retention
★
15∞-28∞
1/16” min.
(1.6mm)
15∞-28∞
1/16” min.
(1.6mm)
34
★
The shallow angle
will reduce
skiving on the
O.D. upon
bearing insertion.
STANDARD BEARING
INSTALLATION
Edge damage to journal bearings is possible
when improperly assembled. Proper assembly not only avoids installation problems but
ensures excellent long term performance.
FLANGED BEARING
INSTALLATION
SYSTEM LUBRICATION INFORMATION
Since lubrication is inherent in the bearing surface of PolyLube, engineers do not have to worry
about these bearings drying out, causing shaft seizure and costly repairs. Because lubricants are
not required, shaft corrosion can be a problem depending on shaft selection. Polygon recommends shafts of stainless steel or other non-corrosive materials. If non-stainless steel alloys are
used, they should be chrome plated. Where design limits permit, hard anodized aluminum or hard
anodized aluminum penetrated with a Teflon® dispersion is generally recommended.
If lubricants are used with PolyLube bearings, Polygon suggests not using fluorocarbon oils and
greases, as they may soften the PTFE fibers, increasing the bearing’s rate of wear. On the other
hand, hydrocarbon oils may actually reduce wear rates by up to eight times. Liquid lubricants can
carry away heat and reduce the coefficient of friction. Greases can be used to help prevent corrosion and keep contamination out of the housing. Under some circumstances, additional lubrication can increase the performance characteristics of composite bearings.
HIGHLIGHTS
ELECTRICAL PROPERTIES
Polygon also produces epoxy fiberglass tubes to the UL-FW-G-10 specification. PolyLube bearings
exhibit similar electrical properties. The bearing wall provides dielectric strengths in excess of
200 volts/mil.
“Engineers do not have to
worry about PolyLube
bearings drying out.”
FABRICATION GUIDELINES
The most common type of fabrication customers have questions about is how to cut composite
bearing materials. Depending on how critical the squareness (perpendicularity) of the cut needs
to be, on smaller bearings a standard chop saw can be used. The typical tolerance for perpendicularity is 0.005" off the chop saw. Polygon recommends a diamond plated blade tipped with 120
grit diamonds. A rougher grit (80) can be used but that will often times result in a poorer surface
finish. Polygon also recommends having the blade turning at between 1500-3000 rpm with a
water-soluble coolant flooding the tube as it is being cut. This coolant will allow the tube to be cut
without burning the end, will extend the life of the diamond blade, and will reduce the dust particulates generated during the cutting process.
On larger tubes, or when perpendicularity is critical, Polygon recommends cutting the tubes on a
standard lathe. In production, this type of cut is done by mounting a tool post grinder on the cross
slide and dividing the tube using a 120 grit diamond blade. A three jaw chuck is used to turn the
tube indicating the tube so that it turns true to the tool post grinder. The tool post grinder is typically used at between 1500-3000 rpm and the tube is turned at 15-20 rpm when divided. Once
again, the same type of coolant system is recommended. In addition, it is advisable to cut from
the inside out whenever possible to eliminate the fraying of the liner on the inside of the bearing.
★
35
★
Many times after the bearing has been cut a deburning operation needs to take place. A very simple de-burring operation consisting of nothing more than spinning the part and holding a piece of
sand paper against the outside edge of the bearing will work quite well. The reverse is also possible by mounting a piece of sand paper in a drill press spindle and running the part onto the paper
to remove any loose fibers caused by the cutting operation.
When turning the tubes on a lathe, Polygon recommends using a diamond tipped cutting insert.
On our standard CNC lathe, the tube is turned at 2000-3000 rpm with a 0.003" per revolution feed
rate. The depth of the cut is usually dependent on the length of the diamond tip on the cutting insert (typically between 0.060"-0.100"). It is important when cutting fiberglass using a diamond
insert to again use a water soluble coolant to dissipate the heat generated while cutting. Excessive heat will cause the bond between the diamond and the carbide insert to fail, causing the tip
to come off.
“Tube post grinders along
with modern CNC lathes
allow Polygon to customize
bearings to your exact
specs.”
PolyLube
Inside
Identification Diameter
STANDARD SIZES
PGP
XX
Selected
Liner
Outside Length
Diameter
T=Tape F=Fiber
XX
XX
Example
The PolyLube Bearing Part Number System
PGP16F18-16 (1.00" ID x 1.125"
OD x 1.00 Long)
Substitute T for the F to designate
a tape liner. aSmaller tolerance in
length available upon request.
STANDARD SIZES FOR POLYLUBE™ BEARINGS: 1/4" HEAVY WALL DIMENSIONS
Hex or square ID available as well as flange bearings and secondary machining. Most tooling available to make special sizes. ID’s from 20" down to .125". All measurements in inches.
ID
OD
RECOMMENDED
HOUSING BORE
PRESS
FIT
RECOMMENDED
SHAFT SIZE
RUNNING
CLEARANCE
LENGTH
TOLERANCE
1/2
0.5020
0.5040
1.0005
1.0025
0.9985
0.9995
0.0010
0.0040
0.4965
0.4970
0.0010
0.0065
±0.010
PGP10F18
5/8
0.6270
0.6290
1.1255
1.1275
1.1235
1.1245
0.0010
0.0040
0.6215
0.6220
0.0010
0.0065
±0.010
PGP12F20
3/4
0.7525
0.7555
1.2505
1.2525
1.2485
1.2495
0.0010
0.0040
0.7470
0.7475
0.0010
0.0075
±0.010
PF1220
3/4
0.7540
0.7570
1.2515
1.2535
1.2495
1.2505
0.0010
0.0040
0.7485
0.7490
0.0010
0.0075
±0.010
PGP14F22
7/8
0.8775
0.8805
1.3765
1.3785
1.3745
1.3755
0.0010
0.0040
0.8720
0.8725
0.0010
0.0075
±0.010
PF1422
7/8
0.8790
0.8820
1.3765
1.3785
1.3745
1.3755
0.0010
0.0040
0.8735
0.8740
0.0010
0.0075
±0.010
PGP16F24
1
1.0025
1.0055
1.5005
1.5025
1.4985
1.4995
0.0010
0.0040
0.9970
0.9975
0.0010
0.0075
±0.010
PF1624
1
1.0040
1.0070
1.5015
1.5035
1.4995
1.5005
0.0010
0.0040
0.9985
0.9990
0.0010
0.0075
±0.010
PF1826
1-1/8
1.1290
1.1320
1.6265
1.6285
1.6245
1.6255
0.0010
0.0040
1.1235
1.1240
0.0010
0.0075
±0.010
PGP18F26
1-1/8
1.1305
1.1335
1.6265
1.6285
1.6245
1.6255
0.0010
0.0040
1.1250
1.1255
0.0010
0.0075
±0.010
PGP20F28
1-1/4
1.2525
1.2555
1.7515
1.7535
1.7495
1.7505
0.0010
0.0040
1.2470
1.2475
0.0010
0.0075
±0.010
★
PF2028
1-1/4
1.2540
1.2570
1.7515
1.7535
1.7495
1.7505
0.0010
0.0040
1.2485
1.2490
0.0010
0.0075
±0.010
★
PF2230
1-3/8
1.3790
1.3830
1.8765
1.8785
1.8745
1.8755
0.0010
0.0040
1.3735
1.3740
0.0010
0.0085
±0.010
PGP22F30
1-3/8
1.3790
1.3830
1.8765
1.8785
1.8745
1.8755
0.0010
0.0040
1.3735
1.3740
0.0010
0.0085
±0.010
PF2432
1-1/2
1.5040
1.5080
2.0015
2.0035
1.9995
2.0005
0.0010
0.0040
1.4985
1.4990
0.0010
0.0085
±0.010
PGP24F32
1-1/2
1.5040
1.5080
2.0015
2.0035
1.9995
2.0005
0.0010
0.0040
1.4985
1.4990
0.0010
0.0085
±0.010
PF2634
1-5/8
1.6290
1.6330
2.1265
2.1285
2.1245
2.1255
0.0010
0.0040
1.6235
1.6240
0.0010
0.0085
±0.010
PGP26F34
1-5/8
1.6290
1.6330
2.1265
2.1285
2.1245
2.1255
0.0010
0.0040
1.6235
1.6240
0.0010
0.0085
±0.010
PGP28F36
1-3/4
1.7540
1.7580
2.2515
2.2535
2.2495
2.2505
0.0010
0.0040
1.7485
1.7490
0.0010
0.0085
±0.010
PF2836
1-3/4
1.7550
1.7590
2.2525
2.2545
2.2505
2.2515
0.0010
0.0040
1.7495
1.7500
0.0010
0.0085
±0.010
PF3038
1-7/8
1.8800
1.8840
2.3775
2.3795
2.3755
2.3765
0.0010
0.0040
1.8745
1.8750
0.0010
0.0085
±0.010
PGP32F40
2
2.0040
2.0080
2.5020
2.5040
2.4990
2.5005
0.0015
0.0050
1.9960
1.9970
0.0020
0.0105
±0.010
PF3240
2
2.0055
2.0095
2.5025
2.5045
2.4995
2.5010
0.0015
0.0050
1.9975
1.9985
0.0020
0.0105
±0.010
PF3442
2-1/8
2.1305
2.1345
2.6275
2.6295
2.6245
2.6260
0.0015
0.0050
2.1225
2.1235
0.0020
0.0105
±0.010
PGP36F44
2-1/4
2.2540
2.2580
2.7520
2.7540
2.7490
2.7505
0.0015
0.0050
2.2460
2.2470
0.0020
0.0105
±0.010
PF3644
2-1/4
2.2555
2.2595
2.7525
2.7545
2.7495
2.7510
0.0015
0.0050
2.2475
2.2485
0.0020
0.0105
±0.010
36
BEARING PART
NUMBER
NOMINAL
ID
PGP08F16
PolyLube
Inside
PGP
XX
Selected
Liner
Outside Length
Diameter
T=Tape F=Fiber
XX
XX
Example
PGP16F18-16 (1.00" ID x 1.125"
OD x 1.00 Long)
STANDARD SIZES
BEARING PART
NUMBER
NOMINAL
ID
ID
OD
RECOMMENDED
HOUSING BORE
PRESS
FIT
RECOMMENDED
SHAFT SIZE
RUNNING
CLEARANCE
LENGTH
TOLERANCE
PF3846
2-3/8
2.3805
2.3845
2.8775
2.8795
2.8745
2.8760
0.0015
0.0050
2.3725
2.3735
0.0020
0.0105
±0.010
PGP38F46
2-3/8
2.3810
2.3850
2.8770
2.8790
2.8740
2.8755
0.0015
0.0050
2.3730
2.3740
0.0020
0.0105
±0.010
PF4048
2-1/2
2.5060
2.5100
3.0030
3.0050
3.0000
3.0015
0.0015
0.0050
2.4980
2.4990
0.0020
0.0105
±0.010
PGP40F48
2-1/2
2.5060
2.5100
3.0020
3.0040
2.9990
3.0005
0.0015
0.0050
2.4980
2.4990
0.0020
0.0105
±0.010
PGP42F50
2-5/8
2.6330
2.6370
3.1270
3.1290
3.1240
3.1255
0.0015
0.0050
2.6250
2.6260
0.0020
0.0105
±0.010
PF4452
2-3/4
2.7560
2.7600
3.2530
3.2550
3.2500
3.2515
0.0015
0.0050
2.7480
2.4790
0.0020
0.0105
±0.010
PGP44F52
2-3/4
2.7580
2.7620
3.2520
3.2540
3.2490
3.2505
0.0015
0.0050
2.7500
2.7510
0.0020
0.0105
±0.010
PF4856
3
3.0065
3.0105
3.5035
3.5055
3.5005
3.5020
0.0015
0.0050
2.9985
2.9995
0.0020
0.0105
±0.010
PGP48F56
3
3.0100
3.0140
3.5020
3.5040
3.4990
3.5005
0.0015
0.0050
3.0020
3.0030
0.0020
0.0105
±0.010
PF5260
3-1/4
3.2565
3.2605
3.7535
3.7555
3.7505
3.7520
0.0015
0.0050
3.2485
3.2495
0.0020
0.0105
±0.010
PGP52F60
3-1/4
3.2600
3.2640
3.7520
3.7540
3.7490
3.7505
0.0015
0.0050
3.2520
3.2530
0.0020
0.0105
±0.010
PF5664
3-1/2
3.5065
3.5105
4.0035
4.0055
4.0005
4.0020
0.0015
0.0050
3.4985
3.4995
0.0020
0.0105
±0.010
PGP56F64
3-1/2
3.5100
3.5140
4.0020
4.0040
3.9990
4.0005
0.0015
0.0050
3.5020
3.5030
0.0020
0.0105
±0.010
PF6068
3-3/4
3.7565
3.7605
4.2535
4.2555
4.2505
4.2520
0.0015
0.0050
3.7485
3.7495
0.0020
0.0105
±0.010
PGP60F68
3-3/4
3.7600
3.7640
4.2520
4.2540
4.2490
4.2505
0.0015
0.0050
3.7520
3.7530
0.0020
0.0105
±0.010
PF6472
4
4.0090
4.0130
4.5040
4.5060
4.5005
4.5020
0.0020
0.0050
3.9990
4.0005
0.0030
0.0120
±0.010
PGP64F72
4
4.0100
4.0140
4.5020
4.5040
4.4985
4.5000
0.0020
0.0050
4.0000
4.0015
0.0030
0.0120
±0.010
PF6876
4-1/4
4.2590
4.2630
4.7540
4.7560
4.7505
4.7520
0.0020
0.0050
4.2490
4.2505
0.0030
0.0120
±0.010
PGP68F76
4-1/4
4.2600
4.2640
4.7520
4.7540
4.7485
4.7500
0.0020
0.0050
4.2500
4.2515
0.0030
0.0120
±0.010
PF7280
4-1/2
4.5090
4.5130
5.0040
5.0060
5.0005
5.0020
0.0020
0.0050
4.4990
4.5005
0.0030
0.0120
±0.010
PGP72F80
4-1/2
4.5100
4.5140
5.0020
5.0040
4.9985
5.0000
0.0020
0.0050
4.5000
4.5015
0.0030
0.0120
±0.010
PF7684
4-3/4
4.7590
4.7630
5.2540
5.2560
5.2505
5.2520
0.0020
0.0050
4.7490
4.7505
0.0030
0.0120
±0.010
PGP76F84
4-3/4
4.7600
4.7640
5.2500
5.2520
5.2465
5.2480
0.0020
0.0050
4.7500
4.4515
0.0030
0.0120
±0.010
PF8088
5
5.0090
5.0130
5.5040
5.5060
5.5005
5.5020
0.0020
0.0050
4.9990
5.0005
0.0030
0.0120
±0.010
PGP80F88
5
5.0100
5.0140
5.5020
5.5040
5.4985
5.5000
0.0020
0.0050
5.0000
5.0015
0.0030
0.0120
±0.010
★
37
★
PolyLube
Inside
STANDARD SIZES
PGP
XX
Selected
Liner
Outside Length
Diameter
T=Tape F=Fiber
XX
XX
Example
PGP16F18-16 (1.00" ID x 1.125"
OD x 1.00 Long)
ID
OD
RECOMMENDED
HOUSING BORE
PRESS
FIT
RECOMMENDED
SHAFT SIZE
RUNNING
CLEARANCE
LENGTH
TOLERANCE
1/2
0.5020
0.5040
0.7505
0.7515
0.7485
0.7495
0.0010
0.0030
0.5155
0.5160
0.0010
0.0055
±0.010
PGP10F14
5/8
0.6270
0.6290
0.8755
0.8765
0.8735
0.8745
0.0010
0.0030
0.6225
0.6230
0.0010
0.0055
±0.010
PGP12F16
3/4
0.7525
0.7555
1.0005
1.0025
0.9985
0.9995
0.0010
0.0040
0.7470
0.7475
0.0010
0.0075
±0.010
PF1216
3/4
0.7540
0.7570
1.0015
1.0035
0.9995
1.0005
0.0010
0.0040
0.7485
0.7490
0.0010
0.0075
±0.010
PGP14F18
7/8
0.8775
0.8805
1.1255
1.1275
1.1235
1.1245
0.0010
0.0040
0.8720
0.8725
0.0010
0.0075
±0.010
PF1418
7/8
0.8790
0.8820
1.1265
1.1285
1.1245
1.1255
0.0010
0.0040
0.8735
0.8740
0.0010
0.0075
±0.010
PGP16F20
1
1.0025
1.0055
1.2505
1.2525
1.2485
1.2495
0.0010
0.0040
0.9970
0.9975
0.0010
0.0075
±0.010
PF1620
1
1.0040
1.0070
1.2515
1.2535
1.2490
1.2500
0.0010
0.0040
0.9980
0.9985
0.0010
0.0080
±0.010
PF1822
1-1/8
1.1290
1.1320
1.3765
1.3785
1.3740
1.3750
0.0010
0.0040
1.1230
1.1235
0.0010
0.0080
±0.010
PGP18F22
1-1/8
1.1305
1.1335
1.3765
1.3785
1.3740
1.3750
0.0010
0.0040
1.1245
1.1250
0.0010
0.0080
±0.010
PGP20F24
1-1/4
1.2525
1.2555
1.5005
1.5025
1.4980
1.4990
0.0010
0.0040
1.2465
1.2470
0.0010
0.0080
±0.010
★
PF2024
1-1/4
1.2540
1.2570
1.5015
1.5035
1.4990
1.5000
0.0010
0.0040
1.2480
1.2485
0.0010
0.0080
±0.010
★
PF2226
1-3/8
1.3790
1.3830
1.6265
1.6285
1.6240
1.6250
0.0010
0.0040
1.3730
1.3735
0.0010
0.0090
±0.010
PGP22F26
1-3/8
1.3790
1.3830
1.6265
1.6285
1.6240
1.6250
0.0010
0.0040
1.3730
1.3735
0.0010
0.0090
±0.010
PF2428
1-1/2
1.5040
1.5080
1.7515
1.7535
1.7490
1.7500
0.0010
0.0040
1.4980
1.4985
0.0010
0.0090
±0.010
PGP24F28
1-1/2
1.5040
1.5080
1.7515
1.7535
1.7490
1.7500
0.0010
0.0040
1.4980
1.4985
0.0010
0.0090
±0.010
PF2630
1-5/8
1.6290
1.6330
1.8765
1.8785
1.8740
1.8750
0.0010
0.0040
1.6230
1.6235
0.0010
0.0090
±0.010
PGP26F30
1-5/8
1.6290
1.6330
1.8765
1.8785
1.8740
1.8750
0.0010
0.0040
1.6230
1.6235
0.0010
0.0090
±0.010
PGP28F32
1-3/4
1.7540
1.7580
2.0015
2.0035
1.9990
2.0000
0.0010
0.0040
1.7475
1.7485
0.0010
0.0095
±0.010
PF2832
1-3/4
1.7555
1.7595
2.0015
2.0035
1.9990
2.0000
0.0010
0.0040
1.7490
1.7500
0.0010
0.0095
±0.010
PF3034
1-7/8
1.8800
1.8840
2.1265
2.1285
2.1240
2.1250
0.0010
0.0040
1.8735
1.8745
0.0010
0.0095
±0.010
PGP32F36
2
2.0040
2.0080
2.2515
2.2535
2.2480
2.2495
0.0015
0.0050
1.9955
1.9965
0.0020
0.0110
±0.010
PF3236
2
2.0055
2.0095
2.2525
2.2545
2.2490
2.2505
0.0015
0.0050
1.9970
1.9980
0.0020
0.0110
±0.010
PF3438
2-1/8
2.1305
2.1345
2.3775
2.3795
2.3740
2.3755
0.0015
0.0050
2.1220
2.1230
0.0020
0.0110
±0.010
PGP36F40
2-1/4
2.2540
2.2580
2.5020
2.5040
2.4985
2.5000
0.0015
0.0050
2.2455
2.2465
0.0020
0.0110
±0.010
PF3640
2-1/4
2.2555
2.2595
2.5025
2.5045
2.4990
2.5005
0.0015
0.0050
2.2470
2.2480
0.0020
0.0110
±0.010
38
BEARING PART
NUMBER
NOMINAL
ID
PGP08F12
PolyLube
Inside
PGP
XX
Selected
Liner
Outside Length
Diameter
T=Tape F=Fiber
XX
XX
Example
PGP16F18-16 (1.00" ID x 1.125"
OD x 1.00 Long)
STANDARD SIZES
BEARING PART
NUMBER
NOMINAL
ID
ID
OD
RECOMMENDED
HOUSING BORE
PRESS
FIT
RECOMMENDED
SHAFT SIZE
RUNNING
CLEARANCE
LENGTH
TOLERANCE
PF3842
2-3/8
2.3805
2.3845
2.6275
2.6295
2.6240
2.6255
0.0015
0.0050
2.3720
2.3730
0.0020
0.0110
±0.010
PGP38F42
2-3/8
2.3810
2.3850
2.6270
2.6290
2.6235
2.6250
0.0015
0.0050
2.3725
2.3735
0.0020
0.0110
±0.010
PF4044
2-1/2
2.5060
2.5100
2.7525
2.7545
2.7490
2.7505
0.0015
0.0050
2.4975
2.4985
0.0020
0.0110
±0.010
PGP40F44
2-1/2
2.5060
2.5100
2.7520
2.7540
2.7485
2.7500
0.0015
0.0050
2.4975
2.4985
0.0020
0.0110
±0.010
PGP42F46
2-5/8
2.6330
2.6370
2.8770
2.8790
2.8735
2.8750
0.0015
0.0050
2.6245
2.6255
0.0020
0.0110
±0.010
PF4448
2-3/4
2.7560
2.7600
3.0030
3.0050
2.9995
3.0010
0.0015
0.0050
2.7475
2.7485
0.0020
0.0110
±0.010
PGP44F48
2-3/4
2.7580
2.7620
3.0020
3.0040
2.9985
3.0000
0.0015
0.0050
2.7495
2.7505
0.0020
0.0110
±0.010
PF4852
3
3.0065
3.0105
3.2530
3.2550
3.2495
3.2510
0.0015
0.0050
2.9980
2.9990
0.0020
0.0110
±0.010
PGP48F52
3
3.0100
3.0140
3.2520
3.2540
3.2485
3.2500
0.0015
0.0050
3.0015
3.0025
0.0020
0.0110
±0.010
PF5256
3-1/4
3.2565
3.2605
3.5035
3.5055
3.5000
3.5015
0.0015
0.0050
3.2480
3.2490
0.0020
0.0110
±0.010
PGP52F56
3-1/4
3.2600
3.2640
3.5020
3.5040
3.4985
3.5000
0.0015
0.0050
3.2515
3.2525
0.0020
0.0110
±0.010
PF5660
3-1/2
3.5065
3.5105
3.7555
3.7575
3.7520
3.7535
0.0015
0.0050
3.4980
3.4990
0.0020
0.0110
±0.010
PGP56F60
3-1/2
3.5100
3.5140
3.7520
3.7540
3.7485
3.7500
0.0015
0.0050
3.5015
3.5025
0.0020
0.0110
±0.010
PF6064
3-3/4
3.7565
3.7605
4.0035
4.0055
4.0000
4.0015
0.0015
0.0050
3.7480
3.7490
0.0020
0.0110
±0.010
PGP60F64
3-3/4
3.7600
3.7640
4.0020
4.0040
3.9985
4.0000
0.0015
0.0050
3.7515
3.7525
0.0020
0.0110
±0.010
PF6468
4
4.0090
4.0130
4.2540
4.2560
4.2500
4.2515
0.0020
0.0060
3.9990
4.0000
0.0030
0.0120
±0.010
PGP64F68
4
4.0100
4.0140
4.2520
4.2540
4.2480
4.2495
0.0020
0.0060
4.0000
4.0010
0.0030
0.0120
±0.010
PF6872
4-1/4
4.2590
4.2630
4.5040
4.5060
4.5000
4.5015
0.0020
0.0060
4.2490
4.2500
0.0030
0.0120
±0.010
PGP68F72
4-1/4
4.2600
4.2640
4.4990
4.5010
4.4950
4.4965
0.0020
0.0060
4.2500
4.2510
0.0030
0.0120
±0.010
PF7276
4-1/2
4.5090
4.5130
4.7540
4.7560
4.7500
4.7515
0.0020
0.0060
4.4990
4.5000
0.0030
0.0120
±0.010
PGP72F76
4-1/2
4.5100
4.5140
4.7520
4.7540
4.7480
4.7495
0.0020
0.0060
4.5000
4.5010
0.0030
0.0120
±0.010
PF7680
4-3/4
4.7590
4.7630
5.0040
5.0060
5.0000
5.0015
0.0020
0.0060
4.7490
4.7500
0.0030
0.0120
±0.010
PGP76F80
4-3/4
4.7600
4.7640
5.0020
5.0040
4.9980
4.9995
0.0020
0.0060
4.7500
4.7510
0.0030
0.0120
±0.010
PF8084
5
5.0090
5.0130
5.2540
5.2560
5.2500
5.2515
0.0020
0.0060
4.9990
5.0000
0.0030
0.0120
±0.010
PGP80F84
5
5.0100
5.0140
5.2520
5.2540
5.2480
5.2495
0.0020
0.0060
5.0000
5.0010
0.0030
0.0120
±0.010
★
39
★
PolyLube
Inside
STANDARD SIZES
PGP
XX
Selected
Liner
Outside Length
Diameter
T=Tape F=Fiber
XX
XX
Example
PGP16F18-16 (1.00" ID x 1.125"
OD x 1.00 Long)
ID
OD
RECOMMENDED
HOUSING BORE
PRESS
FIT
RECOMMENDED
SHAFT SIZE
RUNNING
CLEARANCE
LENGTH
TOLERANCE
1/2
0.5020
0.5040
0.6255
0.6265
0.6235
0.6245
0.0010
0.0030
0.4975
0.4980
0.0010
0.0055
±0.010
PF0810
1/2
0.5040
0.5070
0.6265
0.6285
0.6245
0.6255
0.0010
0.0040
0.4985
0.4990
0.0010
0.0075
±0.010
PGP10F12
5/8
0.6270
0.6300
0.7505
0.7525
0.7485
0.7495
0.0010
0.0040
0.6215
0.6220
0.0010
0.0075
±0.010
PF1012
5/8
0.6290
0.6320
0.7515
0.7535
0.7495
0.7505
0.0010
0.0040
0.6235
0.6240
0.0010
0.0075
±0.010
PGP12F14
3/4
0.7525
0.7555
0.8755
0.8775
0.8735
0.8745
0.0010
0.0040
0.7470
0.7475
0.0010
0.0075
±0.010
PF1214
3/4
0.7540
0.7570
0.8765
0.8785
0.8745
0.8755
0.0010
0.0040
0.7485
0.7490
0.0010
0.0075
±0.010
PGP14F16
7/8
0.8755
0.8785
1.0005
1.0025
0.9985
0.9995
0.0010
0.0040
0.8700
0.8705
0.0010
0.0075
±0.010
PF1416
7/8
0.8790
0.8820
1.0015
1.0035
0.9995
1.0005
0.0010
0.0040
0.8735
0.8740
0.0010
0.0075
±0.010
PGP16F18
1
1.0025
1.0055
1.1255
1.1275
1.1235
1.1245
0.0010
0.0040
0.9970
0.9975
0.0010
0.0075
±0.010
PF1618
1
1.0040
1.0070
1.1265
1.1285
1.1245
1.1255
0.0010
0.0040
0.9985
0.9990
0.0010
0.0075
±0.010
PF1820
1-1/8
1.1290
1.1320
1.2515
1.2535
1.2495
1.2505
0.0010
0.0040
1.1235
1.1240
0.0010
0.0075
±0.010
★
PGP18F20
1-1/8
1.1305
1.1335
1.2505
1.2525
1.2485
1.2495
0.0010
0.0040
1.1250
1.1255
0.0010
0.0075
±0.010
★
PGP20F22
1-1/4
1.2525
1.2555
1.3765
1.3785
1.3745
1.3755
0.0010
0.0040
1.2470
1.2475
0.0010
0.0075
±0.010
PF2022
1-1/4
1.2540
1.2570
1.3765
1.3785
1.3745
1.3755
0.0010
0.0040
1.2485
1.2490
0.0010
0.0075
±0.010
PF2224
1-3/8
1.3790
1.3820
1.5015
1.5035
1.4995
1.5005
0.0010
0.0040
1.3735
1.3740
0.0010
0.0075
±0.010
PGP22F24
1-3/8
1.3790
1.3830
1.5005
1.5025
1.4985
1.4995
0.0010
0.0040
1.3735
1.3740
0.0010
0.0085
±0.010
PF2426
1-1/2
1.5040
1.5080
1.6265
1.6285
1.6245
1.6255
0.0010
0.0040
1.4985
1.4990
0.0010
0.0085
±0.010
PGP24F26
1-1/2
1.5040
1.5080
1.6265
1.6285
1.6245
1.6255
0.0010
0.0040
1.4985
1.4890
0.0010
0.0085
±0.010
PF2628
1-5/8
1.6290
1.6330
1.7515
1.7535
1.7495
1.7505
0.0010
0.0040
1.6235
1.6240
0.0010
0.0085
±0.010
PGP26F28
1-5/8
1.6290
1.6330
1.7515
1.7535
1.7495
1.7505
0.0010
0.0040
1.6235
1.6240
0.0010
0.0085
±0.010
PGP28F30
1-3/4
1.7540
1.7580
1.8765
1.8785
1.8745
1.8755
0.0010
0.0040
1.7485
1.7490
0.0010
0.0085
±0.010
PF2830
1-3/4
1.7550
1.7590
1.8765
1.8785
1.8745
1.8755
0.0010
0.0040
1.7495
1.7500
0.0010
0.0085
±0.010
PGP32F34
2
2.0040
2.0080
2.1265
2.1285
2.1245
2.1255
0.0010
0.0040
1.9985
1.9990
0.0010
0.0085
±0.010
PF3234
2
2.0055
2.0095
2.1265
2.1285
2.1245
2.1255
0.0010
0.0040
2.0000
2.0005
0.0010
0.0085
±0.010
40
BEARING PART
NUMBER
NOMINAL
ID
PGP08F10
PFMO40048-40
PolyLube
Inside
PFM
040
Selected
Liner
Outside
Diameter
Length
F
048
40
PFM040048-40
(Fiber Series Lined
Bearing:
40mm ID x 48mm
OD x 40mm Long)
Example
Bearing
Number
STANDARD SIZES
STANDARD SIZES FOR POLYLUBE™ METRIC BEARINGS
Housing bore and shaft diameter tolerances: H7/H8 and h7/h8 respectively. aSmaller tolerance in length available on request. All measurements in millimeters.
BEARING PART
NUMBER
NOMINAL
ID
ID
RECOMMENDED
HOUSING BORE
PRESS
FIT
RUNNING
CLEARANCE
LENGTH
TOLERANCEa
PFM015020-010
15
(0.591)
15.120 15.200
(0.595) (0.598)
20.050
(0.789)
20.100
(0.791)
20.000 20.025
(0.787) (0.788)
0.025
0.100
(0.001) (0.004)
14.975
(0.590)
15.000
(0.591)
0.020
0.200
(0.001) (0.008)
10.000 ± 0.250
(0.394) ± (0.010)
PFM015020-015
15
(0.591)
15.120 15.200
(0.595) (0.598)
20.050
(0.789)
20.100
(0.791)
20.000 20.025
(0.787) (0.788)
0.025
0.100
(0.001) (0.004)
14.975
(0.590)
15.000
(0.591)
0.020
0.200
(0.001) (0.008)
15.000 ± 0.250
(0.591) ± (0.010)
PFM015020-020
15
(0.591)
15.120 15.200
(0.595) (0.598)
20.050
(0.789)
20.100
(0.791)
20.000 20.025
(0.787) (0.788)
0.025
0.100
(0.001) (0.004)
14.975
(0.590)
15.000
(0.591)
0.020
0.200
(0.001) (0.008)
20.000 ± 0.250
(0.787) ± (0.010)
PFM015020-025
15
(0.591)
15.120 15.200
(0.595) (0.598)
20.050
(0.789)
20.100
(0.791)
20.000 20.025
(0.787) (0.788)
0.025
0.100
(0.001) (0.004)
14.975
(0.590)
15.000
(0.591)
0.020
0.200
(0.001) (0.008)
25.000 ± 0.250
(0.984) ± (0.010)
PFM015020-030
15
(0.591)
15.120 15.200
(0.595) (0.598)
20.050
(0.789)
20.100
(0.791)
20.000 20.025
(0.787) (0.788)
0.025
0.100
(0.001) (0.004)
14.975
(0.590)
15.000
(0.591)
0.020
0.200
(0.001) (0.008)
30.000 ± 0.250
(1.181) ± (0.010)
PFM020024-015
20
(0.787)
20.120 20.200
(0.792) (0.795)
24.050 24.100
(0.947) (0.949)
24.000 24.025
(0.945) (0.946)
0.025
0.100
(0.001) (0.004)
19.975
(0.786)
20.000
(0.787)
0.020
0.200
(0.001) (0.008)
14.975 ± 0.250
(0.590) ± (0.010)
PFM020024-020
20
(0.787)
20.120 20.200
(0.792) (0.795)
24.050 24.100
(0.947) (0.949)
24.000 24.025
(0.945) (0.946)
0.025
0.100
(0.001) (0.004)
19.975
(0.786)
20.000
(0.787)
0.020
0.200
(0.001) (0.008)
19.975 ± 0.250
(0.786) ± (0.010)
PFM020024-025
20
(0.787)
20.120 20.200
(0.792) (0.795)
24.050 24.100
(0.947) (0.949)
24.000 24.025
(0.945) (0.946)
0.025
0.100
(0.001) (0.004)
19.975
(0.786)
20.000
(0.787)
0.020
0.200
(0.001) (0.008)
24.975 ± 0.250
(0.983) ± (0.010)
PFM020024-030
20
(0.787)
20.120 20.200
(0.792) (0.795)
24.050 24.100
(0.947) (0.949)
24.000 24.025
(0.945) (0.946)
0.025
0.100
(0.001) (0.004)
19.975
(0.786)
20.000
(0.787)
0.020
0.200
(0.001) (0.008)
29.975 ± 0.250
(1.180) ± (0.010)
PFM020024-035
20
(0.787)
20.120 20.200
(0.792) (0.795)
24.050 24.100
(0.947) (0.949)
24.000 24.025
(0.945) (0.946)
0.025
0.100
(0.001) (0.004)
19.975
(0.786)
20.000
(0.787)
0.020
0.200
(0.001) (0.008)
34.975 ± 0.250
(1.377) ± (0.010)
PFM025030-015
25
(0.984)
25.120 25.200
(0.989) (0.992)
30.050
(1.183)
30.100
(1.185)
30.000 30.025
(1.181) (1.182)
0.025
0.100
(0.001) (0.004)
24.975
(0.983)
25.000
(0.984)
0.020
0.200
(0.001) (0.008)
15.000 ± 0.250
(0.591) ± (0.010)
PFM025030-025
25
(0.984)
25.120 25.200
(0.989) (0.992)
30.050
(1.183)
30.100
(1.185)
30.000 30.025
(1.181) (1.182)
0.025
0.100
(0.001) (0.004)
24.975
(0.983)
25.000
(0.984)
0.020
0.200
(0.001) (0.008)
25.000 ± 0.250
(0.984) ± (0.010)
PFM025030-035
25
(0.984)
25.120 25.200
(0.989) (0.992)
30.050
(1.183)
30.100
(1.185)
30.000 30.025
(1.181) (1.182)
0.025
0.100
(0.001) (0.004)
24.975
(0.983)
25.000
(0.984)
0.020
0.200
(0.001) (0.008)
35.000 ± 0.250
(1.378) ± (0.010)
PFM025030-040
25
(0.984)
25.120 25.200
(0.989) (0.992)
30.050
(1.183)
30.100
(1.185)
30.000 30.025
(1.181) (1.182)
0.025
0.100
(0.001) (0.004)
24.975
(0.983)
25.000
(0.984)
0.020
0.200
(0.001) (0.008)
40.000 ± 0.250
(1.575) ± (0.010)
PFM025030-050
25
(0.984)
25.120 25.200
(0.989) (0.992)
30.050
(1.183)
30.100
(1.185)
30.000 30.025
(1.181) (1.182)
0.025
0.100
(0.001) (0.004)
24.975
(0.983)
25.000
(0.984)
0.020
0.200
(0.001) (0.008)
50.000 ± 0.250
(1.969) ± (0.010)
PFM030036-020
30
(1.181)
30.120 30.200
(1.186) (1.189)
36.050
(1.419)
36.100
(1.421)
36.000 36.025
(1.417) (1.418)
0.025
0.100
(0.001) (0.004)
29.975
(1.180)
30.000
(1.181)
0.020
0.200
(0.001) (0.008)
20.000 ± 0.250
(0.787) ± (0.010)
PFM030036-030
30
(1.181)
30.120 30.200
(1.186) (1.189)
36.050
(1.419)
36.100
(1.421)
36.000 36.025
(1.417) (1.418)
0.025
0.100
(0.001) (0.004)
29.975
(1.180)
30.000
(1.181)
0.020
0.200
(0.001) (0.008)
30.000 ± 0.250
(1.181) ± (0.010)
PFM030036-040
30
(1.181)
30.120 30.200
(1.186) (1.189)
36.050
(1.419)
36.100
(1.421)
36.000 36.025
(1.417) (1.418)
0.025
0.100
(0.001) (0.004)
29.975
(1.180)
30.000
(1.181)
0.020
0.200
(0.001) (0.008)
40.000 ± 0.250
(1.575) ± (0.010)
PFM030036-050
30
(1.181)
30.120 30.200
(1.186) (1.189)
36.050
(1.419)
36.100
(1.421)
36.000 36.025
(1.417) (1.418)
0.025
0.100
(0.001) (0.004)
29.975
(1.180)
30.000
(1.181)
0.020
0.200
(0.001) (0.008)
50.000 ± 0.250
(1.969) ± (0.010)
PFM030036-060
30
(1.181)
30.120 30.200
(1.186) (1.189)
36.050
(1.419)
36.100
(1.421)
36.000 36.025
(1.417) (1.418)
0.025
0.100
(0.001) (0.004)
29.975
(1.180)
30.000
(1.181)
0.020
0.200
(0.001) (0.008)
60.000 ± 0.250
(2.362) ± (0.010)
PFM035041-025
35
(1.378)
35.120 35.200
(1.383) (1.386)
41.050
(1.616)
41.100
(1.618)
41.000
(1.614)
41.025
(1.615)
0.025
0.100
(0.001) (0.004)
34.975
(1.377)
35.000
(1.378)
0.020
0.200
(0.001) (0.008)
25.000 ± 0.250
(0.984) ± (0.010)
PFM035041-035
35
(1.378)
35.120 35.200
(1.383) (1.386)
41.050
(1.616)
41.100
(1.618)
41.000
(1.614)
41.025
(1.615)
0.025
0.100
(0.001) (0.004)
34.975
(1.377)
35.000
(1.378)
0.020
0.200
(0.001) (0.008)
35.000 ± 0.250
(1.378) ± (0.010)
PFM035041-050
35
(1.378)
35.120 35.200
(1.383) (1.386)
41.050
(1.616)
41.100
(1.618)
41.000
(1.614)
41.025
(1.615)
0.025
0.100
(0.001) (0.004)
34.975
(1.377)
35.000
(1.378)
0.020
0.200
(0.001) (0.008)
50.000 ± 0.250
(1.969) ± (0.010)
PFM035041-060
35
(1.378)
35.120 35.200
(1.383) (1.386)
41.050
(1.616)
41.100
(1.618)
41.000
(1.614)
41.025
(1.615)
0.025
0.100
(0.001) (0.004)
34.975
(1.377)
35.000
(1.378)
0.020
0.200
(0.001) (0.008)
60.000 ± 0.250
(2.362) ± (0.010)
PFM035041-070
35
(1.378)
35.120 35.200
(1.383) (1.386)
41.050
(1.616)
41.100
(1.618)
41.000
(1.614)
41.025
(1.615)
0.025
0.100
(0.001) (0.004)
34.975
(1.377)
35.000
(1.378)
0.020
0.200
(0.001) (0.008)
70.000 ± 0.250
(2.756) ± (0.010)
OD
RECOMMENDED
SHAFT SIZE
★
41
★
STANDARD SIZES
PolyLube
Inside
PFMO40048-40
PFM
040
Selected
Liner
Outside
Diameter
Length
F
048
40
Example
Bearing
Number
PFM040048-40
(Fiber Series Lined
Bearing:
40mm ID x 48mm
OD x 40mm Long)
BEARING PART
NUMBER
NOMINAL
ID
ID
OD
RECOMMENDED
HOUSING BORE
PRESS
FIT
RECOMMENDED
SHAFT SIZE
RUNNING
CLEARANCE
LENGTH
TOLERANCEa
PFM040048-025
40
(1.575)
40.120 40.200
(1.580) (1.583)
48.050 48.100
(1.892) (1.894)
48.000 48.025
(1.890) (1.891)
0.025 0.100
(0.001) (0.004)
39.975 40.000
(1.574) (1.575)
0.020
0.200
(0.001) (0.008)
25.000 ± 0.250
(0.984) ± (0.010)
PFM040048-035
40
(1.575)
40.120 40.200
(1.580) (1.583)
48.050 48.100
(1.892) (1.894)
48.000 48.025
(1.890) (1.891)
0.025 0.100
(0.001) (0.004)
39.975 40.000
(1.574) (1.575)
0.020
0.200
(0.001) (0.008)
35.000 ± 0.250
(1.378) ± (0.010)
PFM040048-050
40
(1.575)
40.120 40.200
(1.580) (1.583)
48.050 48.100
(1.892) (1.894)
48.000 48.025
(1.890) (1.891)
0.025 0.100
(0.001) (0.004)
39.975 40.000
(1.574) (1.575)
0.020
0.200
(0.001) (0.008)
50.000 ± 0.250
(1.969) ± (0.010)
PFM040048-070
40
(1.575)
40.120 40.200
(1.580) (1.583)
48.050 48.100
(1.892) (1.894)
48.000 48.025
(1.890) (1.891)
0.025 0.100
(0.001) (0.004)
39.975 40.000
(1.574) (1.575)
0.020
0.200
(0.001) (0.008)
70.000 ± 0.250
(2.756) ± (0.010)
PFM040048-080
40
(1.575)
40.120 40.200
(1.580) (1.583)
48.050 48.100
(1.892) (1.894)
48.000 48.025
(1.890) (1.891)
0.025 0.100
(0.001) (0.004)
39.975 40.000
(1.574) (1.575)
0.020
0.200
(0.001) (0.008)
80.000 ± 0.250
(3.150) ± (0.010)
PFM045053-025
45
(1.772)
45.130 45.230
(1.777) (1.781)
53.055 53.105
(2.089) (2.091)
53.000 53.030
(2.087) (2.088)
0.025 0.105
(0.001) (0.004)
44.975 45.000
(1.771) (1.772)
0.025
0.230
(0.001) (0.009)
25.000 ± 0.250
(0.984) ± (0.010)
PFM045053-035
45
(1.772)
45.130 45.230
(1.777) (1.781)
53.055 53.105
(2.089) (2.091)
53.000 53.030
(2.087) (2.088)
0.025 0.105
(0.001) (0.004)
44.975 45.000
(1.771) (1.772)
0.025
0.230
(0.001) (0.009)
35.000 ± 0.250
(1.378) ± (0.010)
PFM045053-050
45
(1.772)
45.130 45.230
(1.777) (1.781)
53.055 53.105
(2.089) (2.091)
53.000 53.030
(2.087) (2.088)
0.025 0.105
(0.001) (0.004)
44.975 45.000
(1.771) (1.772)
0.025
0.230
(0.001) (0.009)
50.000 ± 0.250
(1.969) ± (0.010)
PFM045053-070
45
(1.772)
45.130 45.230
(1.777) (1.781)
53.055 53.105
(2.089) (2.091)
53.000 53.030
(2.087) (2.088)
0.025 0.105
(0.001) (0.004)
44.975 45.000
(1.771) (1.772)
0.025
0.230
(0.001) (0.009)
70.000 ± 0.250
(2.756) ± (0.010)
PFM045053-090
45
(1.772)
45.130 45.230
(1.777) (1.781)
53.055 53.105
(2.089) (2.091)
53.000 53.030
(2.087) (2.088)
0.025 0.105
(0.001) (0.004)
44.975 45.000
(1.771) (1.772)
0.025
0.230
(0.001) (0.009)
90.000 ± 0.250
(3.543) ± (0.010)
PFM050058-025
50
(1.969)
50.130 50.230
(1.974) (1.978)
58.055 58.105
(2.286) (2.288)
58.000 58.030
(2.283) (2.285)
0.025 0.105
(0.001) (0.004)
49.975 50.000
(1.968) (1.969)
0.025
0.230
(0.001) (0.009)
25.000 ± 0.250
(0.984) ± (0.010)
PFM050058-035
50
(1.969)
50.130 50.230
(1.974) (1.978)
58.055 58.105
(2.286) (2.288)
58.000 58.030
(2.283) (2.285)
0.025 0.105
(0.001) (0.004)
49.975 50.000
(1.968) (1.969)
0.025
0.230
(0.001) (0.009)
35.000 ± 0.250
(1.378) ± (0.010)
PFM050058-050
50
(1.969)
50.130 50.230
(1.974) (1.978)
58.055 58.105
(2.286) (2.288)
58.000 58.030
(2.283) (2.285)
0.025 0.105
(0.001) (0.004)
49.975 50.000
(1.968) (1.969)
0.025
0.230
(0.001) (0.009)
50.000 ± 0.250
(1.969) ± (0.010)
PFM050058-075
50
(1.969)
50.130 50.230
(1.974) (1.978)
58.055 58.105
(2.286) (2.288)
58.000 58.030
(2.283) (2.285)
0.025 0.105
(0.001) (0.004)
49.975 50.000
(1.968) (1.969)
0.025
0.230
(0.001) (0.009)
75.000 ± 0.250
(2.953) ± (0.010)
PFM050058-100
50
(1.969)
50.130 50.230
(1.974) (1.978)
58.055 58.105
(2.286) (2.288)
58.000 58.030
(2.283) (2.285)
0.025 0.105
(0.001) (0.004)
49.975 50.000
(1.968) (1.969)
0.025
0.230
(0.001) (0.009)
100.000± 0.250
(3.937) ± (0.010)
PFM055063-040
55
(2.165)
55.145
(2.171)
55.245
(2.175)
63.070 63.120
(2.483) (2.485)
63.000 63.030
(2.480) (2.481)
0.025 0.105
(0.001) (0.004)
54.970 55.000
(2.164) (2.165)
0.025
0.235
(0.001) (0.009)
40.000 ± 0.250
(1.575) ± (0.010)
PFM055063-055
55
(2.165)
55.145
(2.171)
55.245
(2.175)
63.070 63.120
(2.483) (2.485)
63.000 63.030
(2.480) (2.481)
0.025 0.105
(0.001) (0.004)
54.970 55.000
(2.164) (2.165)
0.025
0.235
(0.001) (0.009)
55.000 ± 0.250
(2.165) ± (0.010)
PFM055063-075
55
(2.165)
55.145
(2.171)
55.245
(2.175)
63.070 63.120
(2.483) (2.485)
63.000 63.030
(2.480) (2.481)
0.025 0.105
(0.001) (0.004)
54.970 55.000
(2.164) (2.165)
0.025
0.235
(0.001) (0.009)
75.000 ± 0.250
(2.953) ± (0.010)
PFM055063-090
55
(2.165)
55.145
(2.171)
55.245
(2.175)
63.070 63.120
(2.483) (2.485)
63.000 63.030
(2.480) (2.481)
0.025 0.105
(0.001) (0.004)
54.970 55.000
(2.164) (2.165)
0.025
0.235
(0.001) (0.009)
90.000 ± 0.250
(3.543) ± (0.010)
PFM055063-110
55
(2.165)
55.145
(2.171)
55.245
(2.175)
63.070 63.120
(2.483) (2.485)
63.000 63.030
(2.480) (2.481)
0.025 0.105
(0.001) (0.004)
54.970 55.000
(2.164) (2.165)
0.025
0.235
(0.001) (0.009)
110.000± 0.250
(4.331) ± (0.010)
PFM060070-030
60
(2.362)
60.145 60.245
(2.368) (2.372)
70.070 70.120
(2.759) (2.761)
70.000 70.030
(2.756) (2.757)
0.025 0.105
(0.001) (0.004)
59.970 60.000
(2.361) (2.362)
0.025
0.235
(0.001) (0.009)
30.000 ± 0.250
(1.181) ± (0.010)
PFM060070-045
60
(2.362)
60.145 60.245
(2.368) (2.372)
70.070 70.120
(2.759) (2.761)
70.000 70.030
(2.756) (2.757)
0.025 0.105
(0.001) (0.004)
59.970 60.000
(2.361) (2.362)
0.025
0.235
(0.001) (0.009)
45.000 ± 0.250
(1.772) ± (0.010)
PFM060070-060
60
(2.362)
60.145 60.245
(2.368) (2.372)
70.070 70.120
(2.759) (2.761)
70.000 70.030
(2.756) (2.757)
0.025 0.105
(0.001) (0.004)
59.970 60.000
(2.361) (2.362)
0.025
0.235
(0.001) (0.009)
60.000 ± 0.250
(2.362) ± (0.010)
PFM060070-090
60
(2.362)
60.145 60.245
(2.368) (2.372)
70.070 70.120
(2.759) (2.761)
70.000 70.030
(2.756) (2.757)
0.025 0.105
(0.001) (0.004)
59.970 60.000
(2.361) (2.362)
0.025
0.235
(0.001) (0.009)
90.000 ± 0.250
(3.543) ± (0.010)
PFM060070-120
60
(2.362)
60.145 60.245
(2.368) (2.372)
70.070 70.120
(2.759) (2.761)
70.000 70.030
(2.756) (2.757)
0.025 0.105
(0.001) (0.004)
59.970 60.000
(2.361) (2.362)
0.025
0.235
(0.001) (0.009)
120.000± 0.250
(4.724) ± (0.010)
★
42
★
PolyLube
Inside
PFMO40048-40
PGP
XX
Selected
Liner
Outside Length
Diameter
T=Tape F=Fiber
XX
XX
Example
Bearing
Number
PFM040048-40
(Fiber Series Lined
Bearing:
40mm ID x 48mm
OD x 40mm Long)
STANDARD SIZES
BEARING PART
NUMBER
NOMINAL
ID
ID
OD
RECOMMENDED
HOUSING BORE
PRESS
FIT
RECOMMENDED
SHAFT SIZE
RUNNING
CLEARANCE
LENGTH
TOLERANCEa
PFM065075-050
65
(2.559)
65.145 65.245
(2.565) (2.569)
75.070 75.120
(2.956) (2.957)
75.000 75.030
(2.953) (2.954)
0.025
0.105
(0.001) (0.004)
64.970 65.000
(2.558) (2.559)
0.025 0.235
(0.001) (0.009)
50.000 ± 0.250
(1.969) ± (0.010)
PFM065075-065
65
(2.559)
65.145 65.245
(2.565) (2.569)
75.070 75.120
(2.956) (2.957)
75.000 75.030
(2.953) (2.954)
0.025
0.105
(0.001) (0.004)
64.970 65.000
(2.558) (2.559)
0.025 0.235
(0.001) (0.009)
65.000 ± 0.250
(2.559) ± (0.010)
PFM065075-075
65
(2.559)
65.145 65.245
(2.565) (2.569)
75.070 75.120
(2.956) (2.957)
75.000 75.030
(2.953) (2.954)
0.025
0.105
(0.001) (0.004)
64.970 65.000
(2.558) (2.559)
0.025 0.235
(0.001) (0.009)
75.000 ± 0.250
(2.953) ± (0.010)
PFM065075-100
65
(2.559)
65.145 65.245
(2.565) (2.569)
75.070 75.120
(2.956) (2.957)
75.000 75.030
(2.953) (2.954)
0.025
0.105
(0.001) (0.004)
64.970 65.000
(2.558) (2.559)
0.025 0.235
(0.001) (0.009)
100.000 ± 0.250
(3.937) ± (0.010)
PFM065075-130
65
(2.559)
65.145 65.245
(2.565) (2.569)
75.070 75.120
(2.956) (2.957)
75.000 75.030
(2.953) (2.954)
0.025
0.105
(0.001) (0.004)
64.970 65.000
(2.558) (2.559)
0.025 0.235
(0.001) (0.009)
130.000 ± 0.250
(5.118) ± (0.010)
PFM070080-050
70
(2.756)
70.145 70.245
(2.762) (2.766)
80.070 80.120
(3.152) (3.154)
80.000 80.030
(3.150) (3.151)
0.025
0105
(0.001) (0.004)
69.970 70.000
(2.755) (2.756)
0.025 0.235
(0.001) (0.009)
50.000 ± 0.250
(1.969) ± (0.010)
PFM070080-070
70
(2.756)
70.145 70.245
(2.762) (2.766)
80.070 80.120
(3.152) (3.154)
80.000 80.030
(3.150) (3.151)
0.025
0105
(0.001) (0.004)
69.970 70.000
(2.755) (2.756)
0.025 0.235
(0.001) (0.009)
70.000 ± 0.250
(2.756) ± (0.010)
PFM070080-100
70
(2.756)
70.145 70.245
(2.762) (2.766)
80.070 80.120
(3.152) (3.154)
80.000 80.030
(3.150) (3.151)
0.025
0105
(0.001) (0.004)
69.970 70.000
(2.755) (2.756)
0.025 0.235
(0.001) (0.009)
100.000 ± 0.250
(3.937) ± (0.010)
PFM070080-125
70
(2.756)
70.145 70.245
(2.762) (2.766)
80.070 80.120
(3.152) (3.154)
80.000 80.030
(3.150) (3.151)
0.025
0105
(0.001) (0.004)
69.970 70.000
(2.755) (2.756)
0.025 0.235
(0.001) (0.009)
125.000 ± 0.250
(4.921) ± (0.010)
PFM070080-140
70
(2.756)
70.145 70.245
(2.762) (2.766)
80.070 80.120
(3.152) (3.154)
80.000 80.030
(3.150) (3.151)
0.025
0105
(0.001) (0.004)
69.970 70.000
(2.755) (2.756)
0.025 0.235
(0.001) (0.009)
140.000 ± 0.250
(5.512) ± (0.010)
PFM075085-050
75
(2.953)
75.175 75.275
(2.960) (2.964)
85.075 85.125
(3.349) (3.351)
85.000 85.035
(3.346) (3.348)
0.025
0.110
(0.001) (0.004)
74.970 75.000
(2.952) (2.953)
0.050 0.265
(0.002) (0.010)
50.000 ± 0.250
(1.969) ± (0.010)
PFM075085-075
75
(2.953)
75.175 75.275
(2.960) (2.964)
85.075 85.125
(3.349) (3.351)
85.000 85.035
(3.346) (3.348)
0.025
0.110
(0.001) (0.004)
74.970 75.000
(2.952) (2.953)
0.050 0.265
(0.002) (0.010)
75.000 ± 0.250
(2.953) ± (0.010)
PFM075085-100
75
(2.953)
75.175 75.275
(2.960) (2.964)
85.075 85.125
(3.349) (3.351)
85.000 85.035
(3.346) (3.348)
0.025
0.110
(0.001) (0.004)
74.970 75.000
(2.952) (2.953)
0.050 0.265
(0.002) (0.010)
100.000 ± 0.250
(3.937) ± (0.010)
PFM075085-125
75
(2.953)
75.175 75.275
(2.960) (2.964)
85.075 85.125
(3.349) (3.351)
85.000 85.035
(3.346) (3.348)
0.025
0.110
(0.001) (0.004)
74.970 75.000
(2.952) (2.953)
0.050 0.265
(0.002) (0.010)
125.000 ± 0.250
(4.921) ± (0.010)
PFM075085-150
75
(2.953)
75.175 75.275
(2.960) (2.964)
85.075 85.125
(3.349) (3.351)
85.000 85.035
(3.346) (3.348)
0.025
0.110
(0.001) (0.004)
74.970 75.000
(2.952) (2.953)
0.050 0.265
(0.002) (0.010)
150.000 ± 0.250
(5.906) ± (0.010)
PFM080090-050
80
(3.150)
80.175 80.275
(3.156) (3.160)
90.075 90.125
(3.546) (3.548)
90.000 90.035
(3.543) (3.545)
0.025
0.110
(0.001) (0.004)
79.970 80.000
(3.148) (3.150)
0.050 0.265
(0.002) (0.010)
50.000 ± 0.250
(1.969) ± (0.010)
PFM080090-075
80
(3.150)
80.175 80.275
(3.156) (3.160)
90.075 90.125
(3.546) (3.548)
90.000 90.035
(3.543) (3.545)
0.025
0.110
(0.001) (0.004)
79.970 80.000
(3.148) (3.150)
0.050 0.265
(0.002) (0.010)
75.000 ± 0.250
(2.953) ± (0.010)
PFM080090-100
80
(3.150)
80.175 80.275
(3.156) (3.160)
90.075 90.125
(3.546) (3.548)
90.000 90.035
(3.543) (3.545)
0.025
0.110
(0.001) (0.004)
79.970 80.000
(3.148) (3.150)
0.050 0.265
(0.002) (0.010)
100.000 ± 0.250
(3.937) ± (0.010)
PFM080090-125
80
(3.150)
80.175 80.275
(3.156) (3.160)
90.075 90.125
(3.546) (3.548)
90.000 90.035
(3.543) (3.545)
0.025
0.110
(0.001) (0.004)
79.970 80.000
(3.148) (3.150)
0.050 0.265
(0.002) (0.010)
125.000 ± 0.250
(4.921) ± (0.010)
PFM080090-150
80
(3.150)
80.175 80.275
(3.156) (3.160)
90.075 90.125
(3.546) (3.548)
90.000 90.035
(3.543) (3.545)
0.025
0.110
(0.001) (0.004)
79.975 80.000
(3.148) (3.150)
0.050 0.265
(0.002) (0.010)
150.000 ± 0.250
(5.906) ± (0.010)
PFM085095-050
85
(3.346)
85.175 85.275
(3.353) (3.357)
95.075 95.125
(3.743) (3.745)
95.000 95.035
(3.740) (3.742)
0.025
0.110
(0.001) (0.004)
84.970 85.000
(3.345) (3.346)
0.050 0.265
(0.002) (0.010)
50.000 ± 0.250
(1.969) ± (0.010)
PFM085095-085
85
(3.346)
85.175 85.275
(3.353) (3.357)
95.075 95.125
(3.743) (3.745)
95.000 95.035
(3.740) (3.742)
0.025
0.110
(0.001) (0.004)
84.970 85.000
(3.345) (3.346)
0.050 0.265
(0.002) (0.010)
85.000 ± 0.250
(3.346) ± (0.010)
PFM085095-100
85
(3.346)
85.175 85.275
(3.353) (3.357)
95.075 95.125
(3.743) (3.745)
95.000 95.035
(3.740) (3.742)
0.025
0.110
(0.001) (0.004)
84.970 85.000
(3.345) (3.346)
0.050 0.265
(0.002) (0.010)
100.000 ± 0.250
(3.937) ± (0.010)
PFM085095-125
85
(3.346)
85.175 85.275
(3.353) (3.357)
95.075 95.125
(3.743) (3.745)
95.000 95.035
(3.740) (3.742)
0.025
0.110
(0.001) (0.004)
84.970 85.000
(3.345) (3.346)
0.050 0.265
(0.002) (0.010)
125.000 ± 0.250
(4.921) ± (0.010)
PFM085095-150
85
(3.346)
85.175 85.275
(3.353) (3.357)
95.075 95.125
(3.743) (3.745)
95.000 95.035
(3.740) (3.742)
0.025
0.110
(0.001) (0.004)
84.970 85.000
(3.345) (3.346)
0.050 0.265
(0.002) (0.010)
150.000 ± 0.250
(5.906) ± (0.010)
★
43
★
STANDARD SIZES
PolyLube
Inside
PFMO40048-40
PFM
040
Selected
Liner
Outside
Diameter
Length
F
048
40
Example
Bearing
Number
PFM040048-40
(Fiber Series Lined
Bearing:
40mm ID x 48mm
OD x 40mm Long)
BEARING PART
NUMBER
NOMINAL
ID
ID
OD
RECOMMENDED
HOUSING BORE
PRESS
FIT
RECOMMENDED
SHAFT SIZE
PFM090105-050
90
(3.543)
90.175 90.275
(3.550) (3.554)
105.075 105.125
(4.137) (4.139)
105.000 105.035
(4.134) (4.135)
0.025
0.110
(0.001) (0.004)
89.965 90.000
(3.542) (3.543)
0.050
(0.002)
0.270
(0.011)
50.000 ± 0.250
(1.969) ± (0.010)
PFM090105-090
90
(3.543)
90.175 90.275
(3.550) (3.554)
105.075 105.125
(4.137) (4.139)
105.000 105.035
(4.134) (4.135)
0.025
0.110
(0.001) (0.004)
89.965 90.000
(3.542) (3.543)
0.050
(0.002)
0.270
(0.011)
90.000 ± 0.250
(3.543) ± (0.010)
PFM090105-125
90
(3.543)
90.175 90.275
(3.550) (3.554)
105.075 105.125
(4.137) (4.139)
105.000 105.035
(4.134) (4.135)
0.025
0.110
(0.001) (0.004)
89.965 90.000
(3.542) (3.543)
0.050
(0.002)
0.270
(0.011)
125.000 ± 0.250
(4.921) ± (0.010)
PFM090105-150
90
(3.543)
90.175 90.275
(3.550) (3.554)
105.075 105.125
(4.137) (4.139)
105.000 105.035
(4.134) (4.135)
0.025
0.110
(0.001) (0.004)
89.965 90.000
(3.542) (3.543)
0.050
(0.002)
0.270
(0.011)
150.000 ± 0.250
(5.906) ± (0.010)
PFM090105-180
90
(3.543)
90.175 90.275
(3.550) (3.554)
105.075 105.125
(4.137) (4.139)
105.000 105.035
(4.134) (4.135)
0.025
0.110
(0.001) (0.004)
89.965 90.000
(3.542) (3.543)
0.050
(0.002)
0.270
(0.011)
180.000 ± 0.250
(7.087) ± (0.010)
PFM095110-050
95
(3.740)
95.185
(3.747)
95.310
(3.752)
110.850 110.900
(4.364) (4.366)
110.000 110.035
(4.331) (4.332)
0.025
0.110
(0.001) (0.004)
94.965 95.000
(3.739) (3.740)
0.050
(0.002)
0.295
(0.012)
50.000 ± 0.250
(1.969) ± (0.010)
PFM095110-100
95
(3.740)
95.185
(3.747)
95.310
(3.752)
110.850 110.900
(4.364) (4.366)
110.000 110.035
(4.331) (4.332)
0.025
0.110
(0.001) (0.004)
94.965 95.000
(3.739) (3.740)
0.050
(0.002)
0.295
(0.012)
100.000 ± 0.250
(3.937) ± (0.010)
PFM095110-125
95
(3.740)
95.185
(3.747)
95.310
(3.752)
110.850 110.900
(4.364) (4.366)
110.000 110.035
(4.331) (4.332)
0.025
0.110
(0.001) (0.004)
94.965 95.000
(3.739) (3.740)
0.050
(0.002)
0.295
(0.012)
125.000 ± 0.250
(4.921) ± (0.010)
PFM095110-150
95
(3.740)
95.185
(3.747)
95.310
(3.752)
110.850 110.900
(4.364) (4.366)
110.000 110.035
(4.331) (4.332)
0.025
0.110
(0.001) (0.004)
94.965 95.000
(3.739) (3.740)
0.050
(0.002)
0.295
(0.012)
150.000 ± 0.250
(5.906) ± (0.010)
PFM095110-175
95
(3.740)
95.185
(3.747)
95.310
(3.752)
110.850 110.900
(4.364) (4.366)
110.000 110.035
(4.331) (4.332)
0.025
0.110
(0.001) (0.004)
94.965 95.000
(3.739) (3.740)
0.050
(0.002)
0.295
(0.012)
175.000 ± 0.250
(6.890) ± (0.010)
PFM100115-075
100
(3.937)
100.185 100.310
(3.944) (3.949)
115.085 115.135
(4.531) (4.533)
115.000 115.035
(4.528) (4.529)
0.025
0.110
(0.001) (0.004)
99.965 100.000
(3.936) (3.937)
0.050
(0.002)
0.295
(0.012)
75.000 ± 0.250
(2.953) ± (0.010)
PFM100115-100
100
(3.937)
100.185 100.310
(3.944) (3.949)
115.085 115.135
(4.531) (4.533)
115.000 115.035
(4.528) (4.529)
0.025
0.110
(0.001) (0.004)
99.965 100.000
(3.936) (3.937)
0.050
(0.002)
0.295
(0.012)
100.000 ± 0.250
(3.937) ± (0.010)
PFM100115-125
100
(3.937)
100.185 100.310
(3.944) (3.949)
115.085 115.135
(4.531) (4.533)
115.000 115.035
(4.528) (4.529)
0.025
0.110
(0.001) (0.004)
99.965 100.000
(3.936) (3.937)
0.050
(0.002)
0.295
(0.012)
125.000 ± 0.250
(4.921) ± (0.010)
PFM100115-150
100
(3.937)
100.185 100.310
(3.944) (3.949)
115.085 115.135
(4.531) (4.533)
115.000 115.035
(4.528) (4.529)
0.025
0.110
(0.001) (0.004)
99.965 100.000
(3.936) (3.937)
0.050
(0.002)
0.295
(0.012)
150.000 ± 0.250
(5.906) ± (0.010)
PFM100115-175
100
(3.937)
100.185 100.310
(3.944) (3.949)
115.085 115.135
(4.531) (4.533)
115.000 115.035
(4.528) (4.529)
0.025
0.110
(0.001) (0.004)
99.965 100.000
(3.936) (3.937)
0.050
(0.002)
0.295
(0.012)
175.000 ± 0.250
(6.890) ± (0.010)
PFM110125-075
110
(4.331)
110.185 110.310
(4.338) (4.343)
125.085 125.135
(4.925) (4.927)
125.000 125.035
(4.921) (4.923)
0.025
0.110
(0.001) (0.004)
109.965 110.000
(4.329) (4.331)
0.050
(0.002)
0.295
(0.012)
75.000 ± 0.250
(2.953) ± (0.010)
PFM110125-100
110
(4.331)
110.185 110.310
(4.338) (4.343)
125.085 125.135
(4.925) (4.927)
125.000 125.035
(4.921) (4.923)
0.025
0.110
(0.001) (0.004)
109.965 110.000
(4.329) (4.331)
0.050
(0.002)
0.295
(0.012)
100.000 ± 0.250
(3.937) ± (0.010)
PFM110125-125
110
(4.331)
110.185 110.310
(4.338) (4.343)
125.085 125.135
(4.925) (4.927)
125.000 125.035
(4.921) (4.923)
0.025
0.110
(0.001) (0.004)
109.965 110.000
(4.329) (4.331)
0.050
(0.002)
0.295
(0.012)
125.000 ± 0.250
(4.921) ± (0.010)
PFM110125-150
110
(4.331)
110.185 110.310
(4.338) (4.343)
125.085 125.135
(4.925) (4.927)
125.000 125.035
(4.921) (4.923)
0.025
0.110
(0.001) (0.004)
109.965 110.000
(4.329) (4.331)
0.050
(0.002)
0.295
(0.012)
150.000 ± 0.250
(5.906) ± (0.010)
PFM110125-175
110
(4.331)
110.185 110.310
(4.338) (4.343)
125.085 125.135
(4.925) (4.927)
125.000 125.035
(4.921) (4.923)
0.025
0.110
(0.001) (0.004)
109.965 110.000
(4.329) (4.331)
0.050
(0.002)
0.295
(0.012)
175.000 ± 0.250
(6.890) ± (0.010)
PFM120135-075
120
(4.724)
120.215 120.340
(4.733) (4.738)
135.090 135.140
(5.319) (5.320)
135.000 135.040
(5.315) (5.317)
0.025
0.140
(0.001) (0.006)
119.965 120.000
(4.723) (4.724)
0.050
(0.002)
0.325
(0.013)
75.000 ± 0.250
(2.953) ± (0.010)
PFM120135-100
120
(4.724)
120.215 120.340
(4.733) (4.738)
135.090 135.140
(5.319) (5.320)
135.000 135.040
(5.315) (5.317)
0.025
0.140
(0.001) (0.006)
119.965 120.000
(4.723) (4.724)
0.050
(0.002)
0.325
(0.013)
100.000 ± 0.250
(3.937) ± (0.010)
PFM120135-125
120
(4.724)
120.215 120.340
(4.733) (4.738)
135.090 135.140
(5.319) (5.320)
135.000 135.040
(5.315) (5.317)
0.025
0.140
(0.001) (0.006)
119.965 120.000
(4.723) (4.724)
0.050
(0.002)
0.325
(0.013)
125.000 ± 0.250
(4.921) ± (0.010)
PFM120135-150
120
(4.724)
120.215 120.340
(4.733) (4.738)
135.090 135.140
(5.319) (5.320)
135.000 135.040
(5.315) (5.317)
0.025
0.140
(0.001) (0.006)
119.965 120.000
(4.723) (4.724)
0.050
(0.002)
0.325
(0.013)
150.000 ± 0.250
(5.906) ± (0.010)
PFM120135-175
120
(4.724)
120.215 120.340
(4.733) (4.738)
135.090 135.140
(5.319) (5.320)
135.000 135.040
(5.315) (5.317)
0.025
0.140
(0.001) (0.006)
119.965 120.000
(4.723) (4.724)
0.050
(0.002)
0.325
(0.013)
175.000 ± 0.250
(6.890) ± (0.010)
★
44
★
RUNNING
CLEARANCE
LENGTH
TOLERANCEa
PolyLube
Inside
PFMO40048-40
PGP
XX
Selected
Liner
Outside Length
Diameter
T=Tape F=Fiber
XX
XX
Example
Bearing
Number
PFM040048-40
(Fiber Series Lined
Bearing:
40mm ID x 48mm
OD x 40mm Long)
STANDARD SIZES
BEARING PART
NUMBER
NOMINAL
ID
ID
OD
RECOMMENDED
HOUSING BORE
PRESS
FIT
RECOMMENDED
SHAFT SIZE
RUNNING
CLEARANCE
LENGTH
TOLERANCEa
PFM130145-075
130
(5.118)
130.215 130.340
(5.127) (5.131)
145.090 145.140
(5.712) (5.714)
145.000 145.040
(5.709) (5.710)
0.025
0.140
(0.001) (0.006)
129.965 130.000
(5.117) (5.118)
0.050 0.325
(0.002) (0.013)
75.000 ± 0.250
(2.953) ± (0.010)
PFM130145-125
130
(5.118)
130.215 130.340
(5.127) (5.131)
145.090 145.140
(5.712) (5.714)
145.000 145.040
(5.709) (5.710)
0.025
0.140
(0.001) (0.006)
129.965 130.000
(5.117) (5.118)
0.050 0.325
(0.002) (0.013)
125.000 ± 0.250
(4.921) ± (0.010)
PFM130145-150
130
(5.118)
130.215 130.340
(5.127) (5.131)
145.090 145.140
(5.712) (5.714)
145.000 145.040
(5.709) (5.710)
0.025
0.140
(0.001) (0.006)
129.965 130.000
(5.117) (5.118)
0.050 0.325
(0.002) (0.013)
150.000 ± 0.250
(5.906) ± (0.010)
PFM130145-175
130
(5.118)
130.215 130.340
(5.127) (5.131)
145.090 145.140
(5.712) (5.714)
145.000 145.040
(5.709) (5.710)
0.025
0.140
(0.001) (0.006)
129.965 130.000
(5.117) (5.118)
0.050 0.325
(0.002) (0.013)
175.000 ± 0.250
(6.890) ± (0.010)
PFM130145-200
130
(5.118)
130.215 130.340
(5.127) (5.131)
145.090 145.140
(5.712) (5.714)
145.000 145.040
(5.709) (5.710)
0.025
0.140
(0.001) (0.006)
129.965 130.000
(5.117) (5.118)
0.050 0.325
(0.002) (0.013)
200.000 ± 0.250
(7.874) ± (0.010)
PFM140155-075
140
(5.512)
140.215 140.340
(5.520) (5.525)
155.090 155.140
(6.106) (6.108)
155.000 155.040
(6.102) (6.104)
0.025
0.140
(0.001) (0.006)
139.965 140.000
(5.510) (5.512)
0.050 0.325
(0.002) (0.013)
75.000 ± 0.250
(2.953) ± (0.010)
PFM140155-125
140
(5.512)
140.215 140.340
(5.520) (5.525)
155.090 155.140
(6.106) (6.108)
155.000 155.040
(6.102) (6.104)
0.025
0.140
(0.001) (0.006)
139.965 140.000
(5.510) (5.512)
0.050 0.325
(0.002) (0.013)
125.000 ± 0.250
(4.921) ± (0.010)
PFM140155-150
140
(5.512)
140.215 140.340
(5.520) (5.525)
155.090 155.140
(6.106) (6.108)
155.000 155.040
(6.102) (6.104)
0.025
0.140
(0.001) (0.006)
139.965 140.000
(5.510) (5.512)
0.050 0.325
(0.002) (0.013)
150.000 ± 0.250
(5.906) ± (0.010)
PFM140155-175
140
(5.512)
140.215 140.340
(5.520) (5.525)
155.090 155.140
(6.106) (6.108)
155.000 155.040
(6.102) (6.104)
0.025
0.140
(0.001) (0.006)
139.965 140.000
(5.510) (5.512)
0.050 0.325
(0.002) (0.013)
175.000 ± 0.250
(6.890) ± (0.010)
PFM140155-200
140
(5.512)
140.215 140.340
(5.520) (5.525)
155.090 155.140
(6.106) (6.108)
155.000 155.040
(6.102) (6.104)
0.025
0.140
(0.001) (0.006)
139.965 140.000
(5.510) (5.512)
0.050 0.325
(0.002) (0.013)
200.000 ± 0.250
(7.874) ± (0.010)
PFM150165-075
150
(5.906)
150.215 150.340
(5.914) (5.919)
165.090 165.140
(6.500) (6.502)
165.000 165.040
(6.496) (6.498)
0.025
0.140
(0.001) (0.006)
149.965 150.000
(5.904) (5.906)
0.050 0.325
(0.002) (0.013)
75.000 ± 0.250
(2.953) ± (0.010)
PFM150165-125
150
(5.906)
150.215 150.340
(5.914) (5.919)
165.090 165.140
(6.500) (6.502)
165.000 165.040
(6.496) (6.498)
0.025
0.140
(0.001) (0.006)
149.965 150.000
(5.904) (5.906)
0.050 0.325
(0.002) (0.013)
125.000 ± 0.250
(4.921) ± (0.010)
PFM150165-150
150
(5.906)
150.215 150.340
(5.914) (5.919)
165.090 165.140
(6.500) (6.502)
165.000 165.040
(6.496) (6.498)
0.025
0.140
(0.001) (0.006)
149.965 150.000
(5.904) (5.906)
0.050 0.325
(0.002) (0.013)
150.000 ± 0.250
(5.906) ± (0.010)
PFM150165-200
150
(5.906)
150.215 150.340
(5.914) (5.919)
165.090 165.140
(6.500) (6.502)
165.000 165.040
(6.496) (6.498)
0.025
0.140
(0.001) (0.006)
149.965 150.000
(5.904) (5.906)
0.050 0.325
(0.002) (0.013)
200.000 ± 0.250
(7.874) ± (0.010)
PFM150165-250
150
(5.906)
150.215 150.340
(5.914) (5.919)
165.090 165.140
(6.500) (6.502)
165.000 165.040
(6.496) (6.498)
0.025
0.140
(0.001) (0.006)
149.965 150.000
(5.904) (5.906)
0.050 0.325
(0.002) (0.013)
250.000 ± 0.250
(9.843) ± (0.010)
★
45
★
STANDARD SIZES
Inside
Diameter in 1⁄16"
Teflon*
Liner
Outside
Diameter in 1⁄16"
Length
PGP
XX
F
XX
XX
Example
PolyLube
Identification
PGP16F18-16
(1.00" ID x 1.125"
OD x 1.00 Long)
*Liner: F= Fiber Series
T= Tape Series
POLYGON PWW INCH SERIES THRUST BEARINGS: DIMENSIONS
All measurements in inches.
BEARING PART
NUMBER
NOMINAL
ID
PWW04F08-3
ID
OD
THICKNESS
1/4
0.2640
0.2540
0.4800
0.5000
0.0680
0.0880
PWW06F12-3
3/8
0.3890
0.3790
0.7300
0.7500
0.0680
0.0880
PWW08F16-3
1/2
0.5130
0.5030
0.9800
1.0000
0.0680
0.0880
PWW10F20-3
5/8
0.6380
0.6280
1.2480
1.2500
0.0680
0.0880
PWW12F24-3
3/4
0.7640
0.7540
1.4800
1.5000
0.0680
0.0880
PWW14F28-3
7/8
0.8880
0.8780
1.7300
1.7500
0.0680
0.0880
PWW16F32-3
1
1.0140
1.0040
1.9800
2.0000
0.0680
0.0880
PWW18F34-3
1-1/8
1.1500
1.1300
2.1050
2.1250
0.0680
0.0880
PWW20F36-3
1-1/4
1.2730
1.2530
2.2300
2.2500
0.0680
0.0880
PWW22F40-3
1-3/8
1.3990
1.3790
2.4800
2.5000
0.0680
0.0880
PWW24F42-3
1-1/2
1.5240
1.5040
2.6050
2.6250
0.0680
0.0880
PWW26F44-3
1-5/8
1.6490
1.6290
2.7300
2.7500
0.0680
0.0880
PWW28F46-3
1-3/4
1.7740
1.7540
2.8550
2.8750
0.0680
0.0880
PWW32F52-3
2
2.0240
2.0040
3.2300
3.2500
0.0680
0.0880
PWW36F54-3
2-1/4
2.2730
2.2530
3.3550
3.3750
0.0680
0.0880
PWW40F60-3
2-1/2
2.5240
2.5040
3.7300
3.7500
0.0680
0.0880
PWW44F66-3
2-3/4
2.7740
2.7540
4.1050
4.1250
0.0680
0.0880
PWW48F72-3
3
3.0240
3.0040
4.4800
4.5000
0.0680
0.0880
★
46
★
The high strength fiberglass laminate
allows for high compressive loading
and excellent resistance to impact.
HIGHLIGHTS
SUPPLEMENTARY DATA
VARIATIONS IN LINER CONSTRUCTION
Is a bearing just a bearing, just a bearing? Absolutely not. Differences between rolling element
bearings are visually obvious. Most design engineers accept that different rolling element bearings generate different performance characteristics. The same understanding in composite journal bearings does not commonly exist.
Evaluate differences in the bearing liner itself. Few would disagree that the bearing liner is critical
to the ultimate performance of the finished bearing. The pictures below show cross-sectional detail photographs of various composite bearings that all claim to be equivalent in performance.
One can easily and visually tell that these liner constructions are different. The question remains:
are these all equivalent? And if not, what does drive performance?
“Is a bearing just a
bearing, just a bearing?”
Absolutely not.
★
47
Backing
Bond
Layer
Liner
The above liners use a resin rich wear surface. While this has some design advantage, it can reduce impact or fatigue resistance by creating the potential for liner delamination.
When high strength bearing liners are applied in a resin rich manufacturing mode, they introduce
an inherent lower impact resistance. Three distinct layers (the liner, bond layer, and backing) induce a tendency for delamination under repeat stress and strain.
The PolyLube™ Fiber and MRP series bearings have their liners applied in a dry manufacturing
mode. They are inherently very resistant to impact because the liner backing has high strength
fiberglass filaments interwoven into the liner backing.
PolyLube Fiber Series Wear Surface
★

POLYLUBE_design-guide copy

Transcription

Similar documents

How To Install Cam Bearings - Dura-Bond

Frigi-Tech - EnergyLogix Solutions Inc.

Miether Core Exchange Program - Miether Bearing Products Inc.

KRS Bearing

Super 100 Large Capacity Chain Hoist (16 to 50 ton capacity)

PLASTIGAUGE®

Artroskopisk åtgärd av patella instabilitet

Engineering Solutions Partner. Camshaft Bearing - Dura-Bond

Technical Data Sheet

Chart L4: Details (sidewalks, stormwater management)