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Use accurate torque controls to improve quality! Case examples can be found in torque handbook 8

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Product Specifications/How To Use

Many adjustable torque wrenches, such as the QL and MTQL models, have a ratchet lever to switch between tightening and loosening (unwinding) modes. But the manual says these can’t be used for unwinding screws and bolts. So what is the ratchet lever for?

Our QL products are torque tools generally used for tightening. The ratchet lever is for emergency loosening of an object right after you have tightened it with the torque wrench. If you have just used the wrench for tightening you probably still have it in your hand. The torque for loosening (unwinding) will generally be less than the torque for tightening and the force will not exceed wrench capacity, so emergency loosening (unwinding) is possible. However, in the case of regular use for loosening (unwinding), or if you don’t know how much tightening torque was applied to a bolt previously, or if the object might be stuck fast (due to an adhesive, seizure, etc.), use a tool specifically designed for loosening (unwinding). Tohnichi supplies torque wrench checkers for routine inspections, so if precision is a concern we recommend that you perform routine inspections with one. (Part of a dimensional drawing of a QL-MH series preset torque wrench is shown below.)

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