... . 1.Standards: ISO,DIN, ANSI /ASME,GB Bolt/Screw and non-standard products2. Products: hex bolts, heavy hex bolts/screws, hex cap screws ... boltsEyebolts, socket bolts, tapping screws, machine screws, wood screws, and non-standard products3.Thread: UNC,UNF,UN 4.Grade: DIN:GR4.8 ... materials,.7.Used in bridges, buildings, machinery, auto, railway ,petrol and other industries Hex head Bolt