GGB Steel Backed Composite Bearings

DU® and DX® Steel Backed Composite Bearings combine the advantages of conventional metallic plane bearings with the design freedom of self-lubricating materials.  The key to their remarkable performance is the unique method by which their lining is mechanically interlocked by sintered impregnation.  Available as conventional sleeve, flanged, thrust washer, and flat strip stock configurations, DU® and DX® bearings meet the need for high load, self-lubricating applications where a low wear rate is paramount. Developed by GGB (An Enpro Industries Company, this family of steel backed composite bearings have excellent lubricating properties and are designed for low profile, rotary and oscillating applications. Their metallic backing not only provides extrordinary strength, it dissipates the heat generated by friction.   Laboratory and field testing has proven that DU® and DX® bearings provide outstanding performance in a wide variety of demanding applications dry or lubricated with speeds of 1000 sfm and loads up to 20,000 psi.  Their light weight and thin profile make them ideal for end of arm tooling, where close tolerance articulation is required. DU® Steel Backed Bearings are found in demanding applications such as pumps, automotive components, aviation landing gear, packaging equipment and robotic end effector devices. Product availability and additional technical information is available on the GGB website at

Specification Test Value Units
Specific Gravity, 73°F D792  3.0
Tensile Strength @ Yield, 73°F D638 psi
Tensile Modulus of Elasticity, 73°F D638 psi
Tensile Elongation (at break), 73°F D638 %
Flexural Strength, 73°F D790 psi
Flexural Modulus of Elasticity D790 psi
Shear Strength, 73°F D732 psi
Compressive Strength – Ultimate  20,000 psi
Compressive Strength at 2% Deformation D695 psi
Compressive Strength at 10% Deformation D695 psi
Deformation Under Load %
Compressive Modulus of Elasticity, 73°F D695
Compressive Strength ⊥ to Laminate (Modulus) psi
Compressive Strength ⊥ to Laminate (Yield) psi
Compressive Strength ⊥ to Laminate (Ultimate) psi
Hardness, Durometer (Shore “D” scale) D2240
Hardness, Rockwell (Scale as noted) D785 Rockwell M
Izod Impact, Notched @ 73°F D256 Type A ft.lbs/in. of notch
Coefficient of Friction (Dry vs Steel) Static PTM55007  .02 – .2
Coefficient of Friction (Dry vs Steel) Dynamic PTM55007  .02 – .2
Maximum Static Bearing Load (P) PTM55007  20,000 psi
Maximum Unlubricated No Load Bearing Velocity (V) PTM55007  1,000 ft/minute
Maximum Limiting PV (Unlubricated) PTM55007  50,000 psi x ft/min.
Wear Factor “K” x 10-10 PTM55010 Cubic in.-min/
Sand Wheel Wear/Abrasion Test UHMW=100
Minimum Mating Surface Hardness Rockwell (Brinnell)
Coefficient of Linear Thermal Expansion E-831(TMA)  6.0 in/in/°F x 10-5
Coefficient of Thermal Expansion // to Laminates E-831(TMA) in/in/°F x 10-5
Coefficient of Thermal Expansion I to Laminates E-831(TMA) in/in/°F x 10-5
Softening Point °F
Heat Deflection Temperature 264 psi D648 °F
Embrittlement Temperature °F Min.
Continuous Service Temperature in Air  536 °F Max.
Short Term Service Temperature  536 °F Max.
Tg-Glass Transition (Amorphous) D3418 °F
Melting Point (Crystalline Peak) D3418 °F
Thermal Conductivity F433  288 BTU-in/(hr/ft2°F)
Dielectric Strength Short Term D149 Volts/mil
Volume Resistivity D257 ohm/cm
Surface Resistivity D257 ohm/cm
Dielectric Constant, 106 Hz D150
Dissipation Factor, 106 Hz D150
Flammability @ 3.1mm(1/8 in.) UL94 UL94
Arc Resistance seconds
Water Absorption, Immersion 24 Hours D570 (2)  nil %
Water Absorption, Immersion Saturation D570 (2)  nil %
Machinability Rating  N/A 1=easy, 10=difficult
Imperial (U.S.) Size Availability (Off the Shelf) .125 ID to 7.0 ID inches
Metric Size Availability (Off the Shelf) 2 ID to 300 ID mm
Characteristics / Attributes  High Load, High Speed, Self-Lubricating, Slim Profile,  **DX® Bearings must be lubricated upon installation**