Screws are tools that utilize the physics and mathematical principles of circular rotation and friction on inclined planes to progressively secure mechanical components. The term "screw" is a general term for fasteners, commonly used in everyday speech. Screws are an indispensable industrial necessity in daily life: small screws used in cameras, eyeglasses, watches, electronics, etc.; general-purpose screws for televisions, electrical appliances, musical instruments, furniture, etc.; and large screws and nuts for engineering, construction, and bridges. For transportation devices, aircraft, trams, and cars, both small and large screws are used. Screws have been a common invention in people's production and life for thousands of years, and from the perspective of application fields, they are a major invention of humanity.
































