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One Kind Of Implosion Expansion Bolt On July 27, 2019, we received a project from a Saudi client. The client wants an expansion bolt , but unlike previous expansion bolts , it is suitable for some cavity type structures that can only be tightened from one sid e. The bolt required by the customer is M16x50mm , grade 10.9 , surface hot dip galvanized.Due to the requirement of working condition and strength grade.We recommend using 35CrMo material. The implosion expansion bolt consists of an outer hexagon bolt, a sleeve, and a conical nut. To use, insert the bolt of the sleeve into the hole that needs to be tightened, use the hexagon wrench to clamp the hexagon on the main sleeve, and use the outer hexagon wrench to clamp the hexagon on the bolt, and tighten it. The conical nut will go up with the rotation to open the slot under the sleeve, and the tightening effect has been achieved. Picture of implosion expansion bolt: C hemical C omponent  of 35CrMo: ...

Introduction and Application of High Strength Bolts 1. Introduction High-strength bolts are high-strength bolts and are a standard part. In general, high-strength bolts can withstand loads larger than normal bolts of the same specification. The shape and connection structure of the high-strength bolt are basically the same as those of the ordinary bolt. The main difference between the two is that the ordinary bolt connection relies on the pressure and shear of the shaft to transmit the shear force, and the pre-tension of the bolt is small when the nut is tightened. The effect of the high-strength bolt connection is to intentionally apply a large pre-tension to the bolt, so that a pressing force is generated between the contact surfaces of the connected parts, so that there is a large friction force perpendicular to the screw direction, relying on this Friction to transmit the connection shear. The pre-tension of the high-strength bolt is realized by tightening the nut. The or...