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Bolt is an important mechanical part, mainly composed of two components: head and screw. The head is usually designed to be easily tightened or loosened with tools (such as wrenches, screwdrivers, etc.), while the screw is a cylinder with external threads that is used to fit in with the nut to achieve a tight connection.

There are many types of bolts to adapt to different application requirements, common bolts include hexagon head bolts, hexagon flange bolts, T-bolts, countersunk bolts, anchor bolts, etc. It is widely used in various engineering and mechanical fields, such as steel structure construction, bridge construction, mechanical equipment manufacturing, automobile maintenance and so on.