... , C3, C4, C5Ball bearings material: AISI52100, AISI440C, AISI304, AISI316, ceramicRetainer: PTFE, nylon, PEEK or stainless steelHardness for rings and balls: 59 ... by shipment:koyo bearing Deep groove ball bearing 6200 6300 series , u groove ball bearing koyo 6205 zz , koyo bearing 6205 ... zz ntn bearing Deep groove ball bearing 6200 6300 series , u groove ball bearing ntn 6205 zz , ntn bearing ...