Physical and operational performance of screw fasteners

Bolt, High strength bolts, Screw

Physical properties mainly refer to the inherent characteristics of  fastener materials used in manufacturing. In the finished product, there is generally no change, such as melting point, coefficient of expansion, magnetic permeability, etc. On the other hand,considering the actual situation of fastener products, does it also include some physical changes during the fastener manufacturing process, such as "surface defects", even "surface decarburization" and "surface hardness (carburization)".

Working performance is a characteristic obtained through processing technology based on functional design requirements. Therefore, fasteners can meet specific requirements such as torque, locking performance, and elasticity. The working performance can also be expressed by the performance of nylon materials such as non-metallic insert locking nuts.