... .standard:ISO,GB,DIN,JIS 4.ISO9001-2008,SGS,ROHS 1.The specification of Hexagon Castle Nuts 1. Standard:DIN, ANSI, BSW, JSB ... steel,Carbon steel, stainless steel or as request3. Grade: Grade 4.8, Grade6.8, Grade8.8, Grade10.9,Grade12.9m,stainless ...