... ,and hot treatment Finish: Chrome Plated Hardness: 40Hrc Min 1. Standard of Hex Socket Bolt: DIN912,ANSI,BS,AS,etc ... Stainless steel.Q235,Q195,1008,40Cr3. Grade of Hex Socket Bolt: Metric size from Grade4.8 to Grade 12. ... size from Grade2 to Grade10.4. Size of Hex Socket Bolt: diameter from M4 to M20 or 1/8 ... to 500mm.5. Surafce Finish of Hex Socket Bolt: plain, black, zinc plated, H.D.G,etc.6. Packing of ...