Grower Reaction® washer utilizes the downward forces of the nut or bolt head to be tightened, to bite with its bottom serrations into the bearing surface.

In this way the friction between the washer and the bearing surface is always higher than the friction in the tightened or loosened thread, thus the reaction torque is successfully transferred onto the bearing surface underneath the nut or bolt head.

Thanks to its design, it is possible to use this product with traditional, high capacity style torque tools.