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The shape and connection structure of the high-strength bolt are basically the same as that of the ordinary bolt. The main difference between the two is that the ordinary bolt connection relies on the pressure and shear resistance of the rod body to transfer shear force. The pre-tension produced by the bolt when tightening the nut is very small, and its influence is not considered. The working principle of high-strength bolt connection is to apply a lot of pre-tension to the bolt intentionally, so that the extrusion pressure is generated between the contact surface of the connecting piece, and there is a lot of friction perpendicular to the direction of the Screw, relying on this friction to transfer the shear force of the connection. The pre-tension of high-strength bolt is achieved by tightening the nut, and the general high-strength bolt adopts torque method and Angle method. Torsional shear high strength bolts use torsional bolt tail to control the pretension.
The bolts connected with high strength bolts are made of grade 10.9s or grade 8.8s high quality alloy structural steel and made by heat treatment. The holes of high strength bolts should be drilled. The aperture of high-strength bolt connected by friction type is 1.5 ~ 2.0mm larger than the nominal diameter of bolt D; The aperture of the high strength bolt connected by pressure type is 1.0 ~ 1.5mm larger than the nominal diameter d of the bolt.
High Strength Bolt,Cup Head Bolt,Extra Large Bolt,Hex Head Inside Bolts
Handan Changlan fasteners manufacturing ,.Co ltd , https://www.hdchanglanjgj.com