DJA MOND Multilayer self-lubricating bushings

Pt..SL self-lubricating bushings, also known as DU bushings, are multilayer plain bearings consisting of a steel backing, a sintered porous bronze layer and a PTFE sliding layer. Maintenance-free and designed for dry operation at temperatures up to +280°C, DJA MOND self-lubricating bushings, also referred to as dry bearings thanks to their PTFE layer, combine good friction properties, low wear and high load capacity. These sliding bushings are suitable for high sliding speeds, with negligible stick-slip effect, low operating clearance, good chemical resistance and low water and moisture absorption. Compared with other self-lubricating materials, such as sintered bronze, engineering polymers or fibre-based materials, the multilayer design prioritizes high sliding speed with reduced clearance, making it ideal for applications where smooth and quiet operation is more important than maximum load capacity.

The backing of these multilayer self-lubricating bushings is made of low-carbon steel and coated with 2 μm of copper to promote adhesion of the sintered porous bronze layer, onto which the PTFE sliding layer is deposited. Bronze or stainless-steel backings are also available for specific application requirements. The operating temperature reaches up to +280°C, and no lubrication is required: during the running-in period, the PTFE transfers a thin lubricating film onto the contact surface, ensuring dry operation of the plain bearing throughout the component’s service life. Oil lubrication provides excellent performance, while the use of grease and MoS₂-based additives is not recommended.