Shop Vermont Gage and GWS/North American thread ring gages for inspecting external threads in machining and quality-control applications. Choose GO or NO-GO members by inch or metric thread size, thread form, direction and required class of fit. A GO ring should pass over the full threaded length to verify assembly with the mating internal thread, while a NO-GO ring should not advance beyond the permitted limit and helps identify undersize or out-of-tolerance threads. Use a matched setting plug to set, calibrate and monitor adjustable thread ring gages for wear. Select Florida Local Stock to see live Suncoast quantities or shop additional sizes, tolerances and configurations online.