... quality 2, long life and low price 3, prompt delivery Self-aliging ball bearingsSeal form: open style, Z, ZZ, RS, ... , C4, C5. Bearing material: bearing steel (9Cr18), stainless steel(AISI440C, AISI304, AISI316), ceramics. Keeper: stainless steel, PTFE, nylon. Bearing ferrule and ball ... 5400121155100211.54800600020.513.20.7200121260110221.54500560023.215.50.9000and more .... self-aliging ball bearings