... 1. Standard of Hex Socket Bolt: DIN912,ANSI,BS,AS,etc.2. Material of Hex Socket Bolt: Carbon steel, Stainless ... steel.Q235,Q195,1008,40Cr3. Grade of Hex Socket Bolt: ... size from Grade2 to Grade10.4. Size of Hex Socket Bolt: diameter from M4 to M20 or 1/8 ... from 10mm to 500mm.5. Surafce Finish of Hex Socket Bolt: plain, black, zinc plated, H.D.G ...