What is the purpose of standard fasteners?

Washers are mainly used to protect the supporting surface of the connected components. Bolts, nuts, and other materials are mostly made of medium carbon steel, and alloy steel is also used. When there are requirements for corrosion resistance or conductivity, copper, copper alloys, and other non-ferrous metals can also be used for manufacturing.

The standards of China and many countries stipulate that threaded connectors are classified according to mechanical properties, and the level code is marked on the fastener. Rivets are made of steel, aluminum alloy, or copper alloy, and the head has various shapes to meet the needs of different riveting joints.