Self Locking Cap Screws with Black Zinc
Category: Self-locking Screws
Self locking cap screws are defined by the angle of their threads. The threads of self-locking screws are precisely angled so that, once the screw is placed, they will not slip or move unless some additional force is applied. After you have screwed a self-locking screw into position, it will not move again unless you use a screwdriver or similar tool to remove it from position. You will have to use force to unscrew a self-locking screw even with the proper tool; they are designed to stay in place.
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