Bolt Features: 1) spec:DIN931,DIN933,DIN85 2) Grade: ... Standards: DIN, ANSI / ASME, BS, GB, JIS, non-standard 2) Diameter: according to customers' order3) Materials: carbon steel, ... plating, nickel plating, heat refining, surface darkening6) Hexagon bolt producing technological process: parcel-anneal-pickling-cold drawing-cold upsetting ... keep improvine our company and developing our business. Bolt