電動扳手主要應用于鋼結構安裝行業，專門安裝鋼結構高強螺栓，高強度螺栓是用來連接鋼結構接點的，通常是用螺栓群的方式出現。
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.
高強螺栓按施工工藝分為扭剪型高強螺栓和大六角高強螺栓。其連接性能和本身的力學性能都是相同的，僅外形不同，都是以扭矩大小確定螺栓的軸向力大小。
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.
緊固高強螺栓必須先初緊、后終緊，而初緊一般是緊扭矩的一半，終緊就要緊固到扭矩值。大六角高強螺栓和普通螺絲外觀相似，初緊可以用沖擊扳手等，終緊必須用定扭矩電動扳手;而扭剪型高強螺栓前頭有一段梅花頭，初緊可以用沖擊扳手，終緊必須用扭剪型電動扳手，電動扭剪扳手可以比較準確地控制擰緊扭矩，利用螺栓定扭矩，當扳手達到一定扭矩時即可剪斷螺栓的梅花頭部分。其扭矩精度和軸向拉力是靠螺栓的定扭矩V型切口來保證的。
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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