国标扭剪型bai高强螺栓为M16、M20、M22、M24四种，现du在也有非国标的M27、zhiM30两种。dao
There are four kinds of national standard torsion shear type Bai high-strength bolts: M16, M20, M22 and M24. At present, there are also non-national standard M27 and zhim30. Dao
国标大六角高强螺栓为M16、M20、M22、M24、M27、M30等几种。
The national standard large hexagon high strength bolts are M16, M20, M22, M24, M27, M30, etc.
具体选用级别要看使用者的要求，比如一个汽车制造商对扭矩扳手的要求是M16级，那M20级拿过去，就会认定为不合格。
The specific selection level depends on the user's requirements. For example, an automobile manufacturer's requirement for a torque wrench is M16. If the M20 level is taken, it will be deemed as unqualified.
手动力矩扳手可分为：预置式、定值式、表盘式、数显式、打滑式、折弯式、以及公斤扳手。当螺钉和螺栓的紧密度关重要的情况下，使用扭矩扳手可以允许操作员施加特定扭矩值。
Manual torque wrench can be divided into: preset type, fixed value type, dial type, digital display type, sliding type, bending type, and kg wrench. When the tightness of screws and bolts is critical, the use of a torque wrench allows the operator to apply specific torque values.
