Groov-Pin - A Trusted Leader in Threaded Inserts, Groov-Pins, and Engineered Fasteners and Components . Supplying U.S. manufacturers with threaded inserts, grooved pins, Speed-Serts, and Tap-Loks for over 80 years. Groov-Pin is also a PTC machining company manufacturing custom turned connectors, fittings, and other complex components for military, aerospace, telecommunications, fluid and gas control, and medical applications.