Torque wrench can be said to be a wrench class in the family

Wrench is the most common mechanical tools, all wrench is based on the lever principle, save people's effort, improve the efficiency of various work. Torque wrench can be said to be a wrench class of the family, its excellent performance, a variety of types, has always occupied a large market in torque wrench. Manual, start and electric are the three development directions of torque wrenches. Because of their respective functional characteristics, they have been applied and mass produced by wrench manufacturers.

1. Manual wrench: it is mainly used for tightening bolts by manual force, so it is suitable for tightening small bolts;

2. Pneumatic spanner: there is no reverse action *, which is widely used, but not suitable for soft connecting bolts;

3. Electric wrench: driven by electric power to tighten the bolts, mainly used in the fastening of large hexagonal bolts.