A Brief Introduction to the Knowledge of Large Hexagon Head High Strength Bolts

Also known as high-strength bolt connection pair, it is one of the most widely used fasteners in steel structures. The national standard is GB/T1228-1991. Generally speaking, this kind of bolts are used in complete sets, and each set includes a screw , A nut and two flat washers. Note that it generally does not contain elastic gaskets. According to the different stress forms of the nodes, high-strength bolts can have friction type connection, pressure type connection and bolt tension connection, which will be explained in detail in the connection design. (Guide: Brief description of full-thread bolts and half-thread bolts)

The strength of high-strength bolts is generally 10.9S and 12.9S. Adding the suffix S is a special way of connecting the pair. High-strength bolts need to use a special torque wrench during construction, which is divided into two steps: initial tightening and final tightening. There are special construction specifications to stipulate.

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