|Factory price head roofing screw
|Stainless Steel,Carbon steel,
|As Picture Shows
|200pcs, also welcome your trail order
|6pcs/inner box, 48pcs/master carton Or According to customer’s requirement
|T/T 30% deposit, balance payment before shipping
|30 days against deposit payment for mass production
|Fireproof Silent Oil-free
A screw is a tool that uses the physical and mathematical principles of the circular rotation and friction of an object to fasten the mechanism of the object step by step. A screw is a common term for fasteners, an everyday colloquial language. Screws are indispensable industrial necessities in daily life: tiny screws used in cameras, glasses, clocks, electronics, etc.; general screws for televisions, electrical products, musical instruments, furniture, etc.; large-scale screws are used in engineering, construction, and bridges Screws and nuts; transportation equipment, airplanes, trams, automobiles, etc. are used together with large and small screws. Screws have important tasks in industry. As long as there is industry on earth, the function of screws will always be important. The screw is a common invention in people’s production and life for thousands of years. According to the application field, it is the first invention of mankind.
The shape of the screw head. Cylindrical head. Half head. sinking head. Spherical cylinder head. Pan head. Half round head. Hex Head.
The main purpose is to make the industrial products form a fixed one. In use, it often occurs that the teeth cannot be closely attached, and the screw heads will be broken if they are tightened too hard, or the teeth will not be locked tightly and fail to meet the conditions of use, which are all problems of accuracy. . Screws are “quantity products”, not hand-made works of art,In mass production, in order to achieve high precision, stable quality and popular price for the purpose of supplying consumers