The nut using 304 stainless steel M3 PTZ CNC machining applies to the M3 standard screw carbon fiber board in Φ4.5MM pore size, without using a wrench to tighten the self-locking. The thread structure using the unique design of the self-locking screw technology, thread the bottom part of the wedge bevel, make the cusp of the bolt on the top of the tightly wedge slant, resulting in the strengthening of the locking force, has excellent resistance to lateral vibration ability to fundamentally solve the ordinary standard thread loosening under vibration.[img-1522-left-thickbox_default]