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We often assemble some machine parts using screws to make them more stable. The screws are convenient but also cause problems. If someone wants to steal your machine parts he just needs to unscrew the screws. If you want to permanently assemble the part, you will need our locked screws to realize this wish. When using this screw, you just need to twist off the screw cup after screwing in the screw. By doing this the screw can never be unscrewed without the cup, and you can keep your machine parts the way they
Zhen Qiu, Zhaonan Yang, Mingxi Zhang, Keyu Long