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Metal-Polymer Bronze Backed PTFE Plain Bearing

DU-B dry bearings with bronze backing are available as special sliding plates
GGB DU-B dry plain bearings with bronze backing and metal polymer composite materials
GGB DU-B Metal-polymer dry running special bearing
GGB DU-B metal-polymer bronze backed special bushing
GGB DU-B metal polymer composite dry thrust washers

Product's benefits

  • Simply Assembly
    Simple assembly
  • Reduced System Cost
    Reduced System Cost
  • Reduce Size and Weight
    Reduce size/weight
  • Quiet Operation
    Quiet Operation
  • Maintenance Free Operation
    Maintenance Free Operation
  • Eliminate Corrosion
    Eliminate corrosion
  • Dry Operation
    Dry operation
  • Dimensional Stability
    Dimensional Stability


  • Very good wear and low friction performance over a wide range of loads, speeds and temperatures in dry running conditions
  • Suitable for lubricated applications
  • Suitable for linear, oscillating and rotating movements
  • Bronze back offers improved corrosion resistance in humid/saline environments
  • Approved to standard EN 1337-2 for structural bearings for civil engineering
  • Approved to standard DIN EN 1797 and ISO 21010 (Cryogenic Vessels – Gas/Material Compatibility) for piping, valves, fittings and other components in both gaseous and liquid oxygen for up to maximum temperature of 60°C and oxygen pressure of 25 bars. Contact GGB for further details
  • Tested acc. to ASTM E595/ECSS-Q-ST-70-02C - Outgassing properties of materials used in Spacecraft equipment

Bearing forms available in standard dimensions

  • Cylindrical bushes
  • Flanged bushes
  • Sliding plates

Bearing forms made to order: standard forms in special dimensions, thrust washers, flanged thrust washers, half-bearings, special shapes obtained by stamping or deep drawing, customized bearing designs

For a lead-free alternative material please visit our DP4-B® bearings webpage.

GGB DU-B - Metal-Polymer Bronze Backed PTFE Plain Bearing Material
GGB DU® and DU-B - Metal-Polymer - Self-Lubricating Bearing Solutions

Operating performance

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Dry Operation Very Good
Lubricated Operation Good
Greased Operation Fair
Machinable Consult with Applications Engineer
RoHS Compliant Not compliant
Standard Sizes Available
Application Excellence
Very Good
Consult with Applications Engineer
Not Available


  • Metal-Polymer Composite Material
  • Bronze Back + Porous Bronze Sinter +
  • PTFE + Lead

Technical specifications

  • General

    Maximum load, p
    - Static 140 20 000 N/mm2 psi
    - Dynamic 140 20 000 N/mm2 psi
    Operating Temperature
    - Min -200 -328 °C °F
    - Max 280 536 °C °F
    Coefficient of linear thermal expansion
    - Parallel to the surface 18 10 10-⁶/K 10-⁶/F
    - Normal to the surface 36 20 10-⁶/K 10-⁶/F
    Maximum sliding speed, U 2.5 500 m/s fpm
    Maximum pU factor 1.8 50 000 N/mm² x m/s psi x fpm
    Coefficient of friction, f 0.02-0.25* 0.02-0.25*
    Oil Lubricated
    Maximum sliding speed, U 5.0 1 000 m/s fpm
    Maximum pU factor 5.0 143 000 N/mm² x m/s psi x fpm
    Coefficient of friction, f 0.02-0.12 0.02-0.12
    Shaft surface roughness, Ra
    - Dry 0.3 - 0.5 12-20 µm µin
    - Lubricated ≤ 0.05 - 0.4 * ≤ 2 - 16 * µm µin
    Shaft surface hardness
    - Unhardened acceptable, improved bearing life > 200 > 200 HB HB
    For Superior Performance Value
    Dry DP4-B
    Oil Lubricated DP4-B
    Grease Lubricated DP4-B
    Water Lubricated DP4-B
    Process Fluid Lubricated DP4-B

* Depending on operating conditions

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