Deep groove ball bearing size:6000,6200,6300,6400series material:bearing steel, GCR15 precision:ABEC-1 hardness:59-63HRC bearing 6100product detail description:1 ... , (AISI) 52100-American, (Din) 100Cr6 -Germany, carbon steel, iron. 4) Shield / Closure: Plain (Open), Z, ZZ, RS, 2RS, 2ZR, 2Z. 5 ... customer to establish friendly relations of cooperation. deep groove ball bearing 6100