radial ball bearing 1621rs:1,ABEC-3,5;Z2V2,Z3V3 2,High speed ... :Z1,Z2 5,C2,C0,C3... Lily bearing is a specialized manufacturer of radial ball bearing 1621rs.Features:1),Shield / closure: Open ... , C55),Material: AISI52100, AISI440C, AISI304, AISI316, Ceramic6),Retainer: PTFE, Nylon, PEEK Or Stainless Steel7),Bore Size:from 6mm to 80mm8),Outside ...