Electric wrenches are mainly used in the steel structure installation industry, specifically to install high-strength bolts for steel structures. High strength bolts are used to connect steel structure joints, usually in the form of bolt groups.

高强螺栓按施工工艺分为扭剪型高强螺栓和大六角高强螺栓。其连接性能和本身的力学性能都是相同的，仅外形不同，都是以扭矩大小确定螺栓的轴向力大小。

High strength bolts are divided into torsion shear type high strength bolts and large hexagonal high strength bolts according to construction technology. The connection performance and mechanical properties of the bolt are the same, with only different appearances. The axial force of the bolt is determined by the torque.

紧固高强螺栓必须先初紧、后终紧，而初紧一般是紧扭矩的一半，终紧就要紧固到扭矩值。大六角高强螺栓和普通螺丝外观相似，初紧可以用冲击扳手等，终紧必须用定扭矩电动扳手;而扭剪型高强螺栓前头有一段梅花头，初紧可以用冲击扳手，终紧必须用扭剪型电动扳手，电动扭剪扳手可以比较准确地控制拧紧扭矩，利用螺栓定扭矩，当扳手达到一定扭矩时即可剪断螺栓的梅花头部分。其扭矩精度和轴向拉力是靠螺栓的定扭矩V型切口来保证的。

Tightening high-strength bolts must first be initially tightened and then finally tightened. The initial tightening is usually half of the tightening torque, and the final tightening must be tightened to the maximum torque value. The appearance of large hexagonal high-strength bolts is similar to that of ordinary screws, and impact wrenches can be used for initial tightening, while fixed torque electric wrenches must be used for final tightening; The front end of the high-strength bolt with torsion shear type has a section of plum blossom head. The initial tightening can be done with an impact wrench, and the final tightening must be done with a torsion shear type electric wrench. The electric torsion shear wrench can accurately control the tightening torque and use the bolt to set the torque. When the wrench reaches a certain torque, the plum blossom head part of the bolt can be cut off. The torque accuracy and axial tension are ensured by the fixed torque V-notch of the bolt.

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