PLB v2 consists of a dual-thread bolt screw and two nuts with different thread lead angles.
The inner nut with a larger lead angle on the bolt is a multiple-thread nut; the outer nut on the bolt is a single-thread nut. When PLB v2 is subjected to vibration or a loosening force of any form, the force initiates the loosening on the inner nut. The slow-moving outer nut will block the inner nut's progression, forming a mechanical lock that is the secret to PLB v2's anti-loosening design.
No other fastening system has been achieved in the world.
This mechanical lock mechanism is a secret contrast to other systems using "friction" to prevent loosening, creating the best benefits for users, including high-anti loosening force, ease in maintenance, and extensive usability...