扭力扳手有一根長的彈性桿，其一端裝著手柄，另一端裝有方頭或六角頭，在方頭或六角頭上套裝一個可換的套筒，用鋼珠卡住。在頂端上還裝有一個長指針。刻度板固定在柄座上，每格刻度值為1N（或kg/m）。
The torque wrench has a long elastic rod, one end of which is equipped with a handle, and the other end is equipped with a square head or hexagonal head. A replaceable sleeve is set on the square head or hexagonal head, which is clamped with steel balls. There is also a long pointer on the top. The scale plate is fixed on the handle base, and the scale value of each grid is 1N (or kg/m).
使用前，先將安裝在扳手上的指示器調整到所需的力矩，然后扳動扳手，當達到該預定力矩時，指示器上的指針就會向銷軸一方轉動，指針與銷軸碰撞，通過音箱信號或傳感信號告知操作者。
Before use, adjust the indicator installed on the wrench to the required torque, and then pull the wrench. When the predetermined torque is reached, the pointer on the indicator will turn towards the pin shaft, and finally the pointer collides with the pin shaft, and inform the operator through the speaker signal or sensor signal.
扭矩扳手（扭力扳手）發出卡塔聲音的原理很簡單，可以分為以下幾個步驟去理解：
The principle of the torque wrench (torque wrench) to make the sound of the chatter is very simple, which can be understood in the following steps:
扭矩扳手在發出“卡塔”聲后是提示已達到你要求的扭矩值了；
The torque wrench will prompt that the torque value you require has been reached after the sound of "jamming";
扭矩扳手所發出的“卡塔”是由本身內部的扭矩釋放結構產生的，其結構分為壓力彈簧扭矩釋放關節扭矩頂桿三結構所組成
The "jam" sent by the torque wrench is generated by its internal torque release structure, which is composed of three structures: pressure spring torque release joint torque ejector rod
在扭矩扳手上設定所需扭矩值（由彈簧套在頂桿上向扭矩釋放關節施壓），鎖定扭矩扳手，開始擰緊螺栓。當螺栓達到扭矩值（當使用扭力大于彈簧的壓力）后，會產生瞬間脫節的效應。在產生脫節效應的瞬間發出關節敲擊，扳手金屬外殼所發出的“卡塔”聲。由此來確認達到扭矩值的提醒作用(其實就象我們手臂關節成15度彎曲放在鐵管里瞬間申直后會碰到鋼管的原理一樣）。
First, set the required torque value on the torque wrench (the spring is sleeved on the ejector pin to apply pressure to the torque release joint), lock the torque wrench and start tightening the bolts. When the bolt reaches the torque value (when the applied torque is greater than the pressure of the spring), it will produce the effect of instant disconnection. At the moment of producing the disjoint effect, the joint will knock, and the metal shell of the wrench will make a "jam" sound. This is to confirm the reminder effect of reaching the torque value (in fact, it is the same as the principle that our arm joint will touch the steel pipe after being bent at 15 degrees and placed in the iron pipe for an instant).
