Screw is a common fastener, widely used in machinery, electrical appliances and buildings.General material is metal or plastic, cylindrical, the surface of the groove engraved with concave and convex called thread.A screw thread is a helical sloping surface around the side of a screw that allows the screw to be fastened by a helical mechanism to a nut or other object that has a corresponding thread on the inside of the screw, called the internal thread.Generally, the inner screw of a screw cap or other object needs to be processed separately, but there is a kind of screw called self-tapping screw, which can cut the inner thread on a soft object, so no special processing is required.
Product Categories : Screws > tapping screw
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