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Screw with Locking Nylon Patch

A patch on the end of thread or in the middle of thread body , which will make screw more fasten once finished installation , Patch can increase friction between screw and workpieces , therefor , anti-loose is more important . there are two kinds of patch , one is 180 degree patch , namely half diameter of body ; another is 360 degree patch that is just a full circle patch , patch length can be given per specific using and requirements .

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