We offer Hex Head Bolt. Commonly use, half or full thread in precision or semi-precision quality develop by hot or cold forged headfriction grip bolts and screw are of high strength for high-pressure vessel plants.range : diameter m 3 to m 50 or 1/8" to 2" length : 8mm to 1500mm or 5/16" to 5ft.phosphate : electro galvanized, hot dip galvanizes, blackodise or passivity.....specifications : is, iso, ifi, din, jis & bs..