Wrench is a tool used to install and disassemble machine parts. It is usually made of alloy structural steel. It is divided into many types. It is loved by the majority of consumers because of its performance and cost performance. It is true that using a wrench can solve the problem of insufficient strength when people disassemble parts, but it will have more or less problems in the process of use. The following list lists the problems that should be paid attention to when using a wrench. I hope you will pay more attention to it.

操作者在拉扳手时用力一定要均匀，只有温柔对待扳手，那么它也就会更快速地打开零件。如果用力不均会造成麻烦，因为突然间猛拉扳手会产生冲量，而在停止用力的瞬间，或许钉或螺栓已经扭过头，这时更会影响使用效率。

When the operator pulls the wrench, the force must be uniform. Only by treating the wrench gently, it will open the parts more quickly. If the force is uneven, it will cause trouble, because suddenly pulling the wrench will produce impulse. At the moment of stopping the force, perhaps the nail or bolt has been turned too far, which will affect the use efficiency.

在操作扳手前，应该将周围的污染物清理干净，否则会影响到的扭矩值。而且零件上如果粘上污染物，那么就更不可能会有正确的扭矩值。

Before operating the wrench, the surrounding pollutants should be cleaned up, otherwise the torque value will be affected. Moreover, if pollutants are stuck on the parts, it is even more impossible to have the correct torque value.

使用扳手都会出现摩擦因素，那么这个摩擦因素有两面性，一方面它可以使得零件更加紧密结合在一起；另一方面可能会带来操作上的错误，用手来拧紧联接的力只有百分之十左右是用于拉紧方面的，而百分之四十是用来克服螺栓头和零件之间的摩擦，沿螺栓和螺孔的配偶螺纹表面也会产生附加的摩擦。所以在拧紧螺栓时，应把所有这些摩擦因素都考虑进去。

The use of wrenches will have friction factors, so this friction factor has two sides. On the one hand, it can make the parts more closely combined; On the other hand, it may lead to operational errors. Only about 10% of the force to tighten the connection by hand is used for tensioning, while 40% is used to overcome the friction between the bolt head and parts. Additional friction will also occur along the mating thread surface of the bolt and screw hole. Therefore, all these friction factors should be taken into account when tightening bolts.

当遇到需要拧紧有损伤的螺母时，操作者要注意通过损伤部位的附加扭矩需要多少，然后把附加扭矩加到的扭矩值上。

When the damaged nut needs to be tightened, the operator should pay attention to the additional torque required through the damaged part, and then add the additional torque to the recommended torque value.

电动扳手没力原因可能是：1、电机损坏；2：电池没电。

The reasons for the lack of force of the electric wrench may be: 1. The motor is damaged; 2: The battery is dead.

电动扳手主要应用于钢结构安装行业，专门安装钢结构高强螺栓，高强度螺栓是用来连接钢结构接点的，通常是用螺栓群的方式出现。高强螺栓可分为扭剪型和大六角型两种，国标扭剪型高强螺栓为M16、M20、M22、M24四种，非国标的M27、M30两种；国标大六角高强螺栓为M16、M20、M22、M24、M27、M30等几种。一般的对于高强螺栓的紧固都要先初紧再终紧，而且每步都需要有严格的扭矩要求。大六角高强螺栓的初紧和终紧都使用定扭矩扳手.故各种电动扳手就是为各种紧固需要而来的。

Electric wrenches are mainly used in the steel structure installation industry. They are specially used to install high-strength bolts of steel structure. High-strength bolts are used to connect steel structure joints, usually in the form of bolt groups. High strength bolts can be divided into torsion shear type and large hexagon type. There are four kinds of national standard torsion shear high strength bolts: M16, M20, M22 and M24, and two kinds of non-national standard M27 and M30; The national standard large hexagon high-strength bolts are M16, M20, M22, M24, M27, M30, etc. Generally, the tightening of high-strength bolts should be first tightened and then finally tightened, and strict torque requirements are required in each step. Constant torque wrenches are used for initial and final tightening of large hexagon high strength bolts Therefore, all kinds of electric wrenches are for various fastening needs.