YG-1 Straight Flute Hand Tap, Square Shank, Series: T6316, Measurement System: Imperial, UNC Thread Standard, 5/16-18 Thread, Bottoming Chamfer, 4 Flutes, HSS, Oxide Treated, 1.13 in Thread Length, 2.72 in Overall Length, 0.318 in Shank Diameter, Low Carbon Steels, Free Machining Carbon Steel, Medium to High Carbon Steels, Low Alloyed Steels, Free Machining Stainless Steels, Pure Aluminum, Aluminum Alloys, Aluminum Alloy Castings, Pure and Alloyed Copper, Free Machining Brass, Alloyed Brass, Zinc and Magnesium Material Application, H2 Thread Limit, Yes Through Coolant