O tongs after using for a long time, there may be "click" sound, is this why? Actually very simple principle, can be divided into the following steps to understand:

1. Suggest you claim on the torque value has reached, first in terms of torque wrench set the required torque value, locking torque wrench, began to tighten the bolt. After when the bolt to the torque value, can produce instant touch effect, thus the "click" sound.

2. By itself of the internal structure of torque release them to release the joint structure is divided into spring pressure, torque, torque of plunger, three structure.

At the moment have a disconnect effect issued a joint percussion, O tongs metal case of "click" sound. From this reminder to confirm to the torque value.