Spiral Flute Tap, 5/16-18, Plug, UNC, 3 Flutes, Steam Oxide
-18, UNC, Overall Length 2 23/32 in, High Speed Steel, Black Oxide, Thread Length 11/16 in, 75 Percent Thread Drill Size F, Thread Limit H3, Class of Fit 2B, Thread Direction Right Hand, Number of Flutes 3.Spiral Flute Tap, Thread Size 5/16 In.