The AST650 series of self-lubricating bushings are made of cast bronze to withstand high load. Cast-iron AST250 series also is available. The finely finished radial holes are embedded with a solid lubricant covering up to 30% of the working surface. During operation, this lubricant automatically deposits a film onto the rotating surface of the shaft, making the bushings suitable for use at extreme temperatures, in high-pressure corrosive chemical environments and water conditions where no lubrication can be introduced.
September 7, 2001