PCM / PCMF dry composite bearings SKF brand, materials are (PEFE) and (POM). [] PTFE composite bushings PTFE bushing equal to domestic SF-1x non-oil lubricated bearings, Steel substrate, sintered bronze spherical powder, a mixture of surface rolling polytetrafluoroethylene (PTFE) and lead, rolled and a sliding bearing. It has a low coefficient of friction, wear resistance, corrosion resistance, no oil lubrication characteristics. Use the product can reduce cost, reduce mechanical volume, avoiding the phenomenon of bite-axis and reduce mechanical noise. [POM POM bush bush] equal to domestic SF-2X boundary lubrication bearing Steel substrate, sintered bronze spherical powder, surface rolled modified POM (POM), and contain storage pits. It is suitable for normal temperature conditions, the low-contained place, replace the traditional copper sleeve to reduce costs and extend the life of both. On the rolling mill use, to save fuel frequency, simplifying replacement program.