沒有特定的標bai準，螺栓du的扭力要求與螺栓的材質有關與zhi選擇扭力扳手的精度是無關的。
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.
根據所dao緊固的物件需要的扭矩精度來選擇扭力扳手的，比方安裝汽車輪胎，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.
還有一種辦法計算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.
于扭力扳手的檢定是另一個問題，根據計量的要求，檢定10%精度的扳手需要3%以上精度的檢定裝置，檢定3%精度的扳手少需要1%精度的檢定裝置。
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.
如果學過質量管理和統(tǒng)計，應該知道，很簡單：扳手精度是取螺栓要求公差的50%，用5%精度的扳手保證10%精度的扭矩，用10%精度的扳手保證20%精度的扭矩，沒有問題。
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：可以設定扭矩，并且扭矩可調。
The most important feature of torque wrench is: can set the torque, and the torque is adjustable.
力矩扳手的應用：
Application of torque wrench:
力矩扳手就是緊固螺栓的，高強螺栓可分為扭剪型和大六角型兩種，國標扭剪型高強螺栓為M16、M20、M22、M24四種，現在也有非國標的M27、M30兩種；國標大六角高強螺栓為M16、M20、M22、M24、M27、M30等幾種。
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.
一般的對于高強螺栓的緊固都要先初緊再終緊，而且每步都需要有嚴格的扭矩要求。大六角高強螺栓的初緊和終緊都必須使用定扭矩扳手。
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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