... to customs' requirement. 1.Standards: ISO,DIN, ANSI /ASME,GB Bolt/Screw and non-standard products2. Products: hex bolts, heavy hex ... screws, hex flange screws,Round head bolts, round head square neck bolts, slotted counter sunk bolts, plow boltsEyebolts, socket bolts, tapping ... , buildings, machinery, auto, railway ,petrol and other industries Hex head Bolt