... ,9.8,10.9,12.96.Standard:DIN,ANSI/ASME,BS,GB,JIS,non-standard(DIN933,DIN931,DIN934 etc or BS917 etc ... or ASME B18.2.1 etc)7.Surface:Plain,zinc plated,black,hot ... .8,10.9,12.9 6.Standard:DIN,ANSI/ASME,BS,GB,JIS,non-standard(DIN933,DIN931,DIN934 etc or BS917 etc ... Office):NO.2,Tariff-freeZone,Qingdao,Shandong,China. good quality hex bolts and nuts