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.

A screw is a tool that utilizes the physical and mathematical principles of the oblique circular rotation and friction of an object to gradually tighten the mechanical components of the object. Screws are a common term for fasteners, commonly used in everyday language. Screws are essential industrial necessities in daily life, such as tiny screws used in cameras, glasses, clocks, electronics, etc; General screws for television, electrical products, musical instruments, furniture, etc; As for engineering, construction, and bridges, large screws and nuts are used; Transportation equipment, airplanes, trams, cars, etc. are used with both large and small screws. Screws bear important tasks in industry, and as long as there is industry on Earth, the function of screws will always be important. The screw has been a common invention in people's production and life for thousands of years, and according to its application field, it is the first great invention of humanity.