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Standardized mechanical parts for fastening and connection. Standard fasteners mainly include bolts, studs, screws, set screws, nuts, washers and rivets.

There are many structural types of bolts, and the head is mostly hexagonal. For bolts subject to impact, vibration or variable load, in order to increase flexibility, the smooth rod part is made into thin sections or hollow. The seat end of the stud is screwed into the threaded hole of the connected part, and the nut matched with the nut end is similar to the bolt nut. The structure of the screw is basically the same as that of the bolt, but the head shape is diverse to adapt to different assembly space, tightening degree and connection appearance. Set screws have different head and end shapes to adapt to different degrees of tightening. There are also many types of nuts, of which hexagon is the most widely used.

The washer is mainly used to protect the supporting surface of the connected parts. Bolts and nuts are mostly made of medium carbon steel or alloy steel. When there are requirements for corrosion prevention or conductivity, they can also be made of copper, copper alloy and other non-ferrous metals.

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