One Click Reaches The Torque. Attention Should Be Paid To Tightening The Nuts Of Car Tires

According to the habits of most drivers, most car tire replacements are handled by specialized stores.

Usually, machines are used to remove and replace tires using torque wrenches. When the torque wrench makes the first click, it indicates that the nut has reached the set torque value and is tightened.
However, many times the machine will continue to tighten until the second, third, or even fourth click occurs, at which point the operator will stop the machine and stop tightening the nut.
In the assumption, the nut will never loosen. Unfortunately, this is not true. Under such impact, if the nut is tightened too much, it is more likely to loosen.
That's why all car manufacturers specifically indicate the correct tire nut tightening torque in the vehicle operation manual. For example, the tire nuts of the BMW 5 series require 120N. m, while the Ford Focus Titanium only requires 95N. m.
Why do manufacturers attach so much importance to this? Because when the nut is installed on the tire bolt or nail, the bolt is stretched due to the tightening of the nut. After applying additional torque and load to the nut, it will cause greater tension to the bolt, exceeding the most suitable range. As a result, the bolt approaches the yield point, ultimately leading to bolt failure.
On the other hand, insufficient fastening is also full of danger. If the tire nut is not tightened properly, it will gradually loosen during regular use or vibration of the car.
When is the best time to tighten tire nuts? Firstly, the operator needs to check the required torque values for different cars. Although the differences between cars may be very small, this inspection is still very important.
Secondly, the most important thing is to use a torque wrench tester or torque wrench testing equipment to test the accuracy of the wrench. Nuoba recommends testing the torque wrench at least once a year or every 5000 uses. Busy specialty stores are likely to have thousands of calibration cycles or inspections per month. Therefore, it is very important to calibrate the torque wrench to maintain precise accuracy at all times.
Of course, torque wrenches are not the only way to tighten tire nuts. Hydraulic pulse guns have also been used to tighten bolts. There is also a fundamental rule that needs to be followed. If using a pulse gun, a torque lower than the indicated value must be used, and a torque wrench must be used to confirm accuracy after tightening is completed.
These precautions may sound very complex, but they need to be firmly remembered. Once the bolt tightening fails, the responsibility caused by excessive tightening will be held accountable to the specialized store responsible for tightening!