1, Material: both inside and outside the circle of stainless steel.

　　2: inner quenching, heat treatment.

　　3, structure of products: extrusion; no oil groove oil hole.

　　4, both inside and outside the circle of the middle layer of PTFE sintered copper network.

　　5, Performance characteristic:with corrosion resistance, self lubrication, self-aligning features, suitable for low speed, heavy load, moisture-proof anticorrosive mechanism.