PTFE lined wrapped bearings

WMU® Bearings

Our WMU range of PTFE lined wrapped bearings is suitable for dry running, low friction, low wear applications. These wrapped bearings have excellent sliding characteristics forming a transfer film that can protect the mating metal surface.

Our PTFE lined wrapped bearings have been developed for high duty, oil lubricate applications. Such applications include, but are not limited to:

  • Automotive suspension struts
  • Shock absorbers
  • Hydraulic cylinders
  • Gear pumps and motors
  • Axial and radial piston pumps and motors

We are able to offer PTFE lined wrapped bearings in metric plain, imperial plain, metric flanged, metric washers, imperial washers, metric strip and imperial strip. Special sizes can be produced to customer requirements,


Structure

  • A lead-free polymer fibre mixture provides an initial transfer film which effectively coats the mating surface of the bearing assembly, forming an oxide-type solid lubricant film

  • Sintered bronze powder provides maximum thermal conductivity away from the bearing surface and also serves as a reservoir for the PTFE mixture

  • Steel backing provides the high load carrying capacity which provides the wrapped bearings with outstanding heat dissipation

  • The copper/tin plating provides excellent corrosion resistance

  • These are versatile and extremely durable wrapped bearings and can be used in many applications. Feel free to contact us for a discussion about how PTFE lined wrapped bearings could fit into your project.


WMU-B & WMU-SS Bronze Backing Strip

In addition to the standard steel-backed PTFE lined wrapped bearings we also offer our WMU-B and WMU-SS range with a bronze or stainless steel backing strip for applications where the standard steel is not suitable. Range, dimensions and tolerances are exactly the same as the standard PTFE lined wrapped bearings.


Structure S.A.E. 1010 steel backing strip with sintered bronze and PTFE layers
Max PV – Dry (N/mm² x m/s) 1.8
Max PV – Oiled (N/mm² x m/s) 2.8
Max Static load (N/mm²) 250
Max Dynamic load (N/mm²) 140
Max Sliding speed – Dry (m/s) 2.5
Max Sliding speed – With Oil (m/s) 5
Operating temperature (°C) -200 to 280
Thermal Conductivity (W/mk) 42
Coefficient of friction – Dry 0.02 to 0.20
Coefficient of friction – With Oil 0.02 to 0.15
Recommended shaft finish (Ra)  0.04 max (N5)
Recommended shaft hardness (HB) 200 min


WMU® Plain Bearings

PTFE lined plain bearings

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WMU® Flanged Bearings

PTFE lined flanged bearings

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WMU® Bearing Strip

PTFE lined bearing strip

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WMU® Washers

PTFE lined washers

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