Threaded insert M3x20

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A threaded insert, also known as a threaded bushing, is a fastener element that is inserted into an object to add a threaded hole. They may be used to repair a stripped threaded hole, provide a durable threaded hole in a soft material, place a thread on a material too thin to accept it, mold or cast threads into a work-piece thereby eliminating a machining operation, or simplify changeover from unified to metric threads or vice versa.