... for bearings 2.Hardness:HRC58-61 3.High precision,ABEC-1,P0 3/16 inch ,4.763mm ball bearing steel ... :AISI52100 GCr152)Size:1/8",1/4",3/16",5/16",5/32",3/8"3)Grade:G10-G10004)Hardness: HRC60-625) ... Comparison ListStateChina Japan America Germany France StandardGBJISAISIDINNFTitleGCr15SUJ-252100100Cr6100C6TitleGCr15SiMnSUJ-3 100CrMn6 Chemical compositionSteel NO.Chemical Composition%CSiMnPSCr100Cr60.90- ...