The threads of steel structure bolt can be divided into three types according to their structural characteristics and uses, namely, common threads, transmission threads and sealing threads. Thread refers to a kind of uniform spiral protrusion on the section of the screw or the surface or inner surface of the bolt, which mainly plays the role of connection, adjustment and transmission of movement.
Ordinary threads of steel structure bolt: is the largest number of threaded parts, the conodont is triangular, used to connect or fasten parts. Ordinary threads are divided into coarse and fine threads according to pitch, and the connection strength of fine threads is higher.
Driving threads of steel structural bolt: The teeth are trapezoidal, rectangular, sawn and triangular, etc. For example, rectangular threads are mainly used for force transfer. Their characteristics are that the transmission efficiency is higher than other threads, but their strength is higher, so their application is limited.
Sealing threads: Used for sealing connection, mainly pipe threads, tapered threads and tapered pipe threads.
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