various of standard and non-standard fasteners (bolts, nuts, screws, etc) 1. material:carbon steel ... 2. standard:GB/DIN/ANSI.etc various of standard and non- ... standard fasteners (bolts, nuts, screws, etc) 1.Metail:Carbon steel ... M683.Standards:DIN ,ANSI/ASME,BS,GB,JIS,Non-standard,JB/T4.Surface:plain,zinc plated,black ...