bolt

bolt and nut

Bolt and Nut before production operations are actually steel wires that are operated on and formed.
Screw forming is done by cold forging method and the hot forging method is used to produce the nuts.
The screw is cylindrical with slots for cutting all kinds of soft and hard materials and the ends of most screws are sharp.
Wrench and screwdriver are tools for using screws. مطالعه بیشتر ...