Deep groove ball bearing: 1.Material: chrome steel. 2.Noise Level Z1,Z2,Z3,Z4 3, ... , construction machinery, construction machinery, and so on. Deep groove ball bearing Features:1.Structure:General,flanged,extended inner ring2.Shield / closure ... , V1 5.Internal clearance codes: C0,C2, C3, C4, C56.Material: AISI52100, AISI440C, AISI304, AISI316, Ceramic7.Retainer: PTFE, Nylon, PEEK Or ...