... .Hardness:HRC58-61 3.High precision,ABEC-1,P0 3/16 inch ,4.763mm ball bearing ... AISI52100 GCr152)Size:1/8",1/4",3/16",5/16",5/32",3/8"3)Grade:G10-G10004) ... noise special bearing 4. Ball valves for liquid and gas etc.8)packing:inner packing: ... Japan America Germany France StandardGBJISAISIDINNFTitleGCr15SUJ-252100100Cr6100C6TitleGCr15SiMnSUJ-3 100CrMn6 Chemical compositionSteel NO.Chemical Composition ...