door bearing 1.Material:chrome steel Gcr15,PTFE, nylon, PEEK or (stainless) steel 2.Styles:OPEN,Z,ZZ,RS,2RS, ... , V15.Radial play:C0, C2, C3, C4, C56.Hardness:59 - 63HRC7.Retainer:PTFE, nylon, PEEK or (stainless) steel8.Application: doors, windows, wheel ...