... bolt and nut1.Material:Low-carbon steel,high tensile mid-carbon steel,alloy steel(35#,45#,40Cr,35CrMoA,25Cr2Mo1VA etc ... 9.8,10.9,12.96.Standard:DIN,ANSI/ASME,BS,GB,JIS,non-standard(DIN933,DIN931,DIN934 etc or ... bolt and nut1.Material:Low-carbon steel,high tensile mid-carbon steel,alloy steel(35#,45#,40Cr,35CrMoA,25Cr2Mo1VA etc ... ,Tariff-freeZone,Qingdao,Shandong,China. good quality hex bolts and nuts