Insert molding means to mold in metal threaded inserts into molded parts during molding process. During molding process, the metal inserts are put onto a tooling pin and then are molded with polyester material. After molding, the metal inserts are already connected with the polyester material with a comparatively high pull-out-strength. Inserts are usually made of steel, brass, and aluminum. Because it is a one step process, it reduces the post operational steps and reduces costs.
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