没有特定的标bai准，螺栓du的扭力要求与螺栓的材质有关与zhi选择扭力扳手的精度是无关的。
There is no specific standard Bai standard, the torque requirement of bolt Du is related to the material of bolt, and has nothing to do with the precision of torque wrench.
根据所dao紧固的物件需要的扭矩精度来选择扭力扳手的，比方安装汽车轮胎，需要100NM±1NM，就需要用1%精度的扭力扳手。
The torque wrench is selected according to the torque accuracy required for the object to be tightened by Dao. For example, if the installation of automobile tire requires 100nm ± 1nm, a torque wrench with 1% accuracy is required.
还有一种办法计算CP值，CP值大于1.33即可，在1.66附近更好。
There is another way to calculate the CP value, CP value is greater than 1.33, and the best value is around 1.66.
于扭力扳手的检定是另一个问题，根据计量的要求，检定10%精度的扳手需要3%以上精度的检定装置，检定3%精度的扳手少需要1%精度的检定装置。
As for the verification of torque wrench is another problem, according to the requirements of measurement, verification of 10% precision wrench requires more than 3% accuracy verification device, and verification of 3% precision wrench requires at least 1% accuracy verification device.
如果学过质量管理和统计，应该知道，很简单：扳手精度是取螺栓要求公差的50%，用5%精度的扳手保证10%精度的扭矩，用10%精度的扳手保证20%精度的扭矩，没有问题。
If you have studied quality management and statistics, you should know that it is very simple: the accuracy of the wrench is 50% of the required tolerance of the bolt, the torque of 10% precision is guaranteed with a 5% precision wrench, and the torque of 20% precision is guaranteed with a 10% precision wrench.
力矩扳手更主要特征就是：可以设定扭矩，并且扭矩可调。
The most important feature of torque wrench is: can set the torque, and the torque is adjustable.
力矩扳手的应用：
Application of torque wrench:
力矩扳手就是紧固螺栓的，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，现在也有非国标的M27、M30两种；国标大六角高强螺栓为M16、M20、M22、M24、M27、M30等几种。
Torque wrench is used to fasten bolts. High strength bolts can be divided into torsion shear type and large hexagon type. There are four kinds of national standard torsional shear high-strength bolts: M16, M20, M22 and M24, and now there are non-national standard M27 and M30; national standard large hexagon high-strength bolts are M16, M20, M22, M24, M27, M30, etc.
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必须使用定扭矩扳手。
Generally, the tightening of high-strength bolts should be first and then final tightening, and each step needs to have strict torque requirements. Constant torque wrench must be used for initial tightening and final tightening of large hexagon high strength bolts.
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