Auto repair crowd how to choose torque wrench

Torque wrench is a commonly used tool in auto repair operations, which can be matched with different specifications of the sleeve. Now the mechanical torque wrench is commonly used in the market, mainly through the auxiliary sleeve can be moved to control the tightness of the spring, so as to adjust the size of the torque. How does a mechanic choose the right torque wrench?

1. Check the instructions and select the appropriate torque

Before we choose a torque wrench, it is recommended to consider the use scenario.Bicycle torque range should be 0-25 N·m; The torque of an automobile engine is generally 30 N·m; The torque required for motorcycles is usually 5-25N·m, with individual screws up to 70N·m. All corresponding torque values are generally indicated in the instructions of various products.

So friends in the auto repair industry should choose different range of tools when working.

2. Choose the right driving head

Many DIY owners in the early maintenance only pay attention to the size of the torque and ignore the matching problem of the sleeve and the driving head, and replace the sleeve back and forth, thus delaying the maintenance of the car.

1/4 (Xiao Fei) driving head is mainly suitable for precision requirements;

3/8 (Zhongfei) is usually used in cars, motorcycles and bicycles for standard operations, a wider range of applications;

1/2 (Big fly) drive head is mainly industrial grade operation requirements

3, 72 teeth a wider range of application

The higher the number of teeth of torque wrench ratchet structure, the smaller the operation Angle required for the same torque demand, and all kinds of narrow Spaces can be easily dealt with.

4. Product quality is the most critical

The key to torsion adjustment is the tightness of the spring. Some loose torsion is smaller and some tight torsion is larger. An important factor determining the service life of the torque wrench is the quality of the spring. Torque wrench used more frequently, more attention should be paid to product quality.

5, high precision is more reliable, certificate is indispensable

There are usually 1-5 grades of torsion force, and the repeatability and error of the corresponding 3 grades are within ±3%. The smaller the error, the more reliable the torque.

In addition, the accuracy of torque wrench will change over time, so it is recommended to be recalibrated by a professional institution every 10000 times or 1 year.