Vermont Metric Thread Plug Gage Assembly, GO/NOGO, Vermont's Thread Gages allow you to inspect the pitch diameter and the functional thread for internal threaded products. All stock Metric Thread Plug Gages are made to Class X tolerances per ASME B1.16M (Metric M Series Screw Threads). A Certificate of Accuracy is included with each gage. Available in 6H, and each Thread Plug Gage is marked with nominal size, threads per inch, class of fit and pitch diameters. Features include... M5.5x.50 Threads GO and NO GO Set Certificate of Accuracy included Select Taperlock, Reversible, or Set Plug from Pull Down Menu. Taperlock Plug 6H... GO Gage Length: 7.1mm NO GO Gage Length: 5.6mm GO Pitch Diameter: 5.175mm NO GO Pitch Diameter: 5.275mm Reversible Plug 6H... GO Gage Length: 19.0mm NO GO Gage Length: 19.0mm GO Pitch Diameter: 5.175mm NO GO Pitch Diameter: 5.275mm Set Plug 6g... GO Gage Length: 10.3mm NO GO Gage Length: 10.3mm GO Pitch Diameter: 5.155mm NO GO Pitch Diameter: 5.080mm