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The "U-Nut" is made of 2 points of the nut body and friction ring (special spring), and the friction ring is fixed to the top of the nut with a clamping process to make it integrated. When tightened, the friction ring will be ground to the bolt thread. Then along the thread, the friction ring begins to sag and press the bolt screw face. Prebeling torque (friction torque) produced by pulling forces (reverse) of the spring back and the bolt nut screw pull. This will prevent loosening action.