Union Butterfield Spiral Flute Tap, High Performance, Series: 1630AP HMD Applix, Measurement System: Imperial, UNF, 5/16-24, Semi-Bottoming Chamfer, 3 Flutes, HSS, TiAlN Coated, Class of Fit: 2B/H4, Right Hand Cutting, 0.472 in Thread Length, 3.543 in Overall Length, 0.318 in Shank Dia, Right Hand Flute Direction, H4 Thread Limit, Alloy Steel, Bronze, Cast Iron, Hardened Steel, Nickel Alloys, Stainless Steel and Titanium Alloys Material Application, No Through Coolant (Yes/No)Designed for blind hole tapping materials with a hardness of >38 RcPremium substrate provides superior abrasion resistance and edge strengthTiAlN top coating lowers the coefficient of friction, improves thread quality, affords higher operating speeds and longer tool lifeReinforced shank