Electric torque wrench shall be installed on the shear bolt. Only when the torque meets the requirements, the quincunx head of the torsional shear bolt can be screwed out to ensure that the bolt used has the necessary pre tightening force, so as to ensure the performance. Therefore, in engineering, whether the plum blossom head can still be used to judge whether it is a torsional shear bolt, and the torsional shear bolt can be used once. Precautions for use of torsional shear bolts:

初拧扳手，可用电动扳手也可用手动带响扳手。但无论用哪种扳手施工前都须进行标定，以便控制初拧扭距值。手动扳手作为终拧工具时，须每班进行标定，并做好标定记录。终柠板手：扭剪螺栓是一种自标量型螺栓，因此终拧只须把高扭剪螺栓尾部螺栓头拧掉即可，扳手不用标定。

For initial tightening, you can use electric spanner or manual spanner with ring. But no matter what kind of wrench is used, it must be calibrated before construction in order to control the initial torque value. When the manual wrench is used as the final tightening tool, it must be calibrated every shift and the calibration record shall be made. Final wrench: the torsional shear bolt is a kind of self scalar bolt, so the final screw only needs to screw off the bolt head at the tail of the high torsional shear bolt, and the wrench does not need to be calibrated.

扭剪螺栓拧紧固定时要注意。只有当梅花头完全插入套筒时，电动扳手开关才能被压下。如果内套只插入梅花头尺寸的1/3~1/2，按下电动扳手开关会导致梅花头滑动，影响套管的使用寿命。紧固时，终拧紧的电动扳手应垂直于部件的摩擦面，扳手倾斜时螺栓尾部的梅花头容易滑动，容易堵塞。

Attention should be paid to the tightening and fixing of torsional shear bolts. The electric wrench switch can only be pressed down when the ring head is fully inserted into the socket. If the inner sleeve is only inserted into 1 / 3 ~ 1 / 2 of the size of the box head, pressing the electric wrench switch will cause the box head to slide and affect the service life of the sleeve. When tightening, the final tightening electric wrench should be perpendicular to the friction surface of the parts. When the wrench is inclined, the box head at the end of the bolt is easy to slide and block.