Union Butterfield Spiral Point Machine Tap, High Performance, Series: 1629AP Applix HMD, Measurement System: Imperial, UNF Thread Standard, 1/2-20 Thread, Plug Chamfer, 3 Flutes, HSS, TiAlN Coated, Class of Fit: 2B, Right Hand Cutting Direction, 0.866 in Thread Length, 3.937 in Overall Length, 0.367 in Shank Diameter, Steel, Stainless Steel, Cast Iron, Titanium, Nickel and Copper Material ApplicationDesigned for through 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 life