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Composite Self-Lubricating Bushings

Composite Self-Lubricating Bushings

AST’s composite, self-lubricating bushings are made up of one of two basic compositions:

  • PTFE-Based Metal-Polymer Materials
  • Thermoplastic-Based Metal-Polymer Materials

Lubrication free bushings are used in applications where extreme agitation of parts and the force of friction to wear on parts. These self-lubricating bushings are able to withstand high temperatures and have high load-bearing tolerances.

More about each series is explained below.

Composite self-lubricating bushings

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Our metal-backed, PTFE-based (polytetrafluoroethylene) polymer bushing materials have a common structure, consisting of a steel backing bonded to a porous bronze sinter layer. This bronze sinter layer is impregnated and overlaid with the filled PTFE bushing lining. The steel backing provides mechanical strength, while the bronze sinter layer provides a strong mechanical bond between the backing and the bushing lining. This construction promotes dimensional stability and improves thermal conductivity. These PTFE linings offer exceptionally low friction.

The AST20 Series has a similar structure to the PTFE-based materials described above; but with this series, the bushing lining consists of a filled thermoplastic extruded tape. The AST 20 Sereies are very similar to DX® brand bushings in structure and are often substituted for DX bushings providing better value.  These materials are generally designed to operate with marginal lubrication. AST20 is most commonly provided with a uniform pattern of indents in the bushing surface that act as grease reservoirs.

AST’s has nearly 1,400 different bushing models that are made of composite materials and are self-lubricating. They are broken down into the following series. Click on each to learn more:

AST Bearings is proudly presenting our new certificates for both the NJ and CA locations: AST Bearings’ ISO 9001:2015 Certificates

To learn more about what the ISO 9001 standard is, the differences between the 2015 and 2008 versions, and how AST verifies customer satisfaction: Learn About AST Bearings’ certification to ISO 9001:2015

Need Assistance Selecting the Proper Composite Self-Lubricating Bushings?

If you need help in selecting the best products for your particular application, please remember that design engineering and application assistance are available from AST as part of our value-added services designed to make your job easier.

Value added services

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