Rebar is a common name for hot-rolled ribbed steel bars. Rebar is a steel that must be used for building components above medium size. The geometry of the transverse rib of rebar mainly includes three types: spiral, herringbone and crescent. The ordering principle of rebar is generally based on the requirements of the grip performance required by the engineering design, and the mechanical process performance or mechanical strength index is the main factor.

Rebar is widely used in construction and decoration. It has high hardness and good performance, which can greatly improve the damage of screw connection and avoid the damage of connecting thread. Because the wire screw sleeve has a certain elasticity, the load distribution on each thread of the thread can be relatively uniform, the pitch and tooth shape deviation between the screw and the screw hole can be eliminated, and vibration can also be absorbed, so the use of rebar can improve the thread connection strength and fatigue strength.