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