What are the materials of screws ?

There are many kinds of screw material, the general use according to the performance level can be divided into, 6.8 level below the use of carbon steel. Grades 8.8-10.9 are made of low carbon alloy steel. Grade 10.9 is made of medium carbon alloy steel. Grade 12.9 adopts alloy steel. Grade 8.8 and above are heat-treated.

1. Screws are tools used to tighten the parts step by step by using the physical and mathematical principles of the inclined plane circular rotation and friction. Screw is a common term for fasteners, everyday colloquialism.

2, screws are indispensable industrial necessities in daily life: such as cameras, glasses, clocks and watches, electronics and other very small screws; General screws for TV, electrical products, Musical Instruments, furniture, etc.; As for engineering, construction, bridge is the use of large screws, nuts; Transportation equipment, aircraft, trams, cars and so on for the size of the screw.