deep groove ball bearing size:6000,6100,6200 6300,6400series material:bearing steel,GCR15 hardness:59-63HRC 16001 2rs low noise deep groove ball bearing detail description:1) Types: 60 ... ,6300-6320 ,6403-6413 3) Material: Gcr15 (Chrome steel) -China, (AISI) 52100-American, (Din) 100Cr6 -Germany, carbon steel, ... Z2, Z3, ZV1, ZV2.ZV3.Z1V1.Z2V2.Z3V3. 6) Precision level: ABEC-1, ABEC-3, ABEC-5, ABEC-7. ...