1.own factory. OEM 2.can be heat treatment by ourself. 3 ... Product Description Detail:Hex bolt Bolt Standard: DIN 933, DIN 931, DIN 558, JIS ISO, BS, ANSI...etc Material: ... C1010,Q235,35#,45#, SUS304,SUS316 etcSurface Finish: Various of finish is available, such as Zinc plate ... 9 Size: L=10-600mm, D: M3-36 Head type: Hex Bolt Packing: 25kg/carton,bulking,36carton/pallet or according ...