Structure:deep groove ball bearing Place of Origin:Hebei China(Mainland) Model Number:623zz 625zz 626zz 627zz 628zz 629zz... Model specificationsShield / closure: Open Bearing, Z, ZZ, RS, 2RS,TTTolerance codes: ABEC-1, ABEC-3, ABEC-5, ABEC-7Vibration level codes: V4, V3, V2, V1Internal clearance codes: C2, C3, C4, C5Material: AISI52100, AISI440C, AISI304, AISI316, Ceramic Retainer: PTFE, Nylon, ...