Bushings of POM (Delrin ®) acetal resin offer the unique characteristic of no "Slip-stick", or the static friction coefficient being equal or lower than dynamic. Typical applications are hemispherical bearings for auto ball-joints; food mixer housing-bearing combinations; wear surfaces on integral gear-spring-cam units for adding machines; clock bushings and many others. The extensive use of POM (Delrin ®) acetal resin as a bearing material has developed because of its combination of low coefficient of friction with self-lubricating properties, good mechanical properties and dimensional stability in many chemical media.