... cage is used. When the outer diameter of bearing is no more than 400 millimeter, stamped ... steel cage is used 2 Bearing Part NO. 6000, 6200, 6300, 6400, 6800, ... 62300 & NR series bearings 3 Extra-large size ball bearings, which ID ranges from 180mm to 6300mm. ... to customers' drawings & samples. 6 Shield/closure: Open ball bearing, Z, ZZ, RS, 2RS, 2RZ 7 Tolerance Code: ...