Specifications:

　1) Sliding contact surfaces: Steel vs. bronze.
　2) Materials: Outer race is made of carbon steel, inner race is made of high chrome bearing steel, medium race is bronze.
　3) Heat treatment: Without heat treatment on outer race and bronze race. Inner race is quenched (hardened), and surface plated with chrome.
　4) Features of structure: With oil groove or oil hole. Outer race formed by extrusion. With a bronze race between outer race and inner race.
　5) Properties: Self-lubricated, low friction, good wearability, self-alignment.