Everyone has used a torque wrench. When it is used, it will make a click to indicate that it has reached your required torque value. Let's take a look at the internal structure of the torque wrench:

扭矩扳手所发出的“卡塔”是由本身内部的扭矩释放结构产生的，其结构分为压力弹簧、扭矩释放关节、扭矩顶杆三结构所组成。在扭矩扳手上设定所需扭矩值（由弹簧套在顶杆上向扭矩释放关节施压），锁定扭矩扳手，开始拧紧螺栓。当螺栓达到扭矩值（当使用扭力大于弹簧的压力）后，会产生瞬间脱节的效应。在产生脱节效应的瞬间发出关节敲击，扳手金属外壳所发出的“卡塔”声。

The "jam" of torque wrench is produced by its internal torque release structure, which is composed of pressure spring, torque release joint and torque ejector. First, set the required torque value on the torque wrench (the spring sleeve presses the torque release joint on the top rod), lock the torque wrench and start to tighten the bolt. When the bolt reaches the torque value (when the applied torque is greater than the spring pressure), it will produce the effect of instantaneous disconnection. At the moment of disjointed effect, the joint knocks and the metal shell of the wrench makes a "Kata" sound.

由此来确认达到扭矩值的提醒作用（其实就象我们手臂关节成15度弯曲放在铁管里瞬间申直后会碰到钢管的原理一样）。

So as to confirm the reminder effect of reaching the torque value (in fact, it's the same principle that our arm joint is bent at 15 degrees and placed in the iron pipe, and will touch the steel pipe immediately after straightening).

扭力扳手也叫扭矩扳手，力矩就是力和距离的乘积，在紧固螺丝螺栓螺母等螺纹紧固件时需要控制施加的力矩大小，以保证螺纹紧固且不于因力矩过大破坏螺纹，所以用扭矩扳手来操作。

Torque wrench is also called torque wrench. Torque is the product of force and distance. When tightening screw, bolt, nut and other threaded fasteners, it is necessary to control the applied torque to ensure that the thread is tight and will not damage the thread due to excessive torque. Therefore, torque wrench is used to operate.

设定好一个需要的扭矩值上限，当施加的扭矩达到设定值时，扳手会发出“卡塔”声响或者扳手连接处折弯一点角度，这就代表已经紧固不要再加力了。

First of all, set a required upper limit of torque value. When the applied torque reaches the set value, the wrench will make a "jam" sound or bend a little angle at the wrench joint, which means that it has been tightened and no more force is needed.