1/2-14 NPTF Plain 6-Step Plug Gage Assembly. Vermont Gage USA Part # 411107080. Use Vermont Gage Pipe Thread Plugs to check tapered and straight internal pipe threads. Perfect for inspecting standard pipe and pipe fittings. Vermont Gage Pipe Thread Plugs are made to precise Class X tolerances and come with Certificate of Accuracy. The NPT and NPTF (Dryseal) series includes standard tapered pitch diameters. The NPSM and NPSF series includes standard straight pitch diameters. Add a taperlock handle to create a complete pipe gage assembly. NIST traceable. Tool Steel; 60/62 HRc (Cold Stabilized). Inch handles ? light blue. Certificate of Accuracy included. Vermont Gage USA Part #411107080