Groov-Pin - Grooved Pins, Threaded Inserts, and Precision Turned Components Groov-Pin is a leading manufacturer of Grooved Pins, Tap-Lok Threaded Inserts, Speedserts, Precision Turned Components, and Barb-Serts. Groov-Pin is a leading U.S. manufacturer of press-fit Grooved Pins, self-tapping Threaded Inserts, and engineered fasteners and Precision Turned Components.