Hex Bolts: Hex Bolts are Half threaded , threaded fasteners with forged Hex Head. Thread Length: Thread length is equal to 2 to 3 times the diameter. Hex Bolts Manufacturing Process: Metric Size Hex Bolts Inch Size Hex Bolts SIZE RANGE: M12- M64 LENGTH UPTO 400MM Materials of Construction: Stainless steel. Nickle Grade Alloys, Hastelloy, Inconel. DUPLEX STEEL. SMO 254 Standard: ASTM A193. DIN 931 DIN 934