Screw is the use of objects of the circular circular rotation and friction of the physical and mathematical principles, step by step to fasten the tools of the tools.
Here to share the screws are often used as follows:
1, carbon steel
At present, the fastener industry is the most used material is carbon steel, because of its high plasticity, relative to other materials cheaper.
2, stainless steel
Stainless steel is usually organized according to the state can be divided into: austenitic steel, martensitic steel, ferritic steel
Brass is made of copper and zinc alloy, corrosion resistance, heat transfer, conductive effect. Generally used for conductive requirements, mechanical performance is not high screw.
Aluminum has good thermal conductivity, electrical conductivity and ductility. In the common metal, the conductivity is second only to silver, copper, but the density is only 1/3 of steel. Because of its good ductility, aluminum is mainly used for the production of various types of rivets.
Copper is a relatively pure kind of copper, generally similar to that is pure copper, conductivity, plastic are better, but the strength, hardness is poor.
Screws often use the material is mainly described above several materials, different screws used materials may be different.