Hex Bolt and Nut bolts and nuts screws 1.Standard:DIN,ANSI,BSW,ISO 2.Material:carbon steel, 3.Size: M3 to M64 bolts and nuts screws Hex Bolt and Nut1.Standard:DIN,ANSI,BSW,JSB,ISO 2.Material:carbon steel,3.Size: M3 to M644.Surface treatment:Plain,ZP,YZP,Black,HDG,Nickel, Chrome,PTFE DIN933 &DIN934 Hex Bolt and Nut , bolts and nuts screws OEM(ISO9001-2010)