The self-adjusting function can compensate the installation error of the matching hole.

The self-adjusting function can compensate the installation error of the matching hole. It has two kinds of threads: self-locking and non-self-locking [1] to prevent the thread from loosening. The fastened teeth can withstand huge torque after riveting, and the torsion resistance of the teeth is extremely high. The earth exceeds its self-locking performance, which may be the torque of the bearing, the high-strength thread occupying the tiny space, the self-locking and the non-self-locking thread, and the thickness of the sheet can be as thin as 0.03 inch / 0.76 mm, the thread size #4 to # 10 and m2 to m6.