Overview Reviews Product Description HSSE - for toughness and increased wear resistance TiAlN coated - increases wear resistance, improves chip flow and reduces chip welding Designed to produce a 2B class of fit ANSI shank / ISO length Spiral point forces the chips ahead of the tap - designed for through hole applications Designed for tough materials such as stainless steel and tool steel up to 38Rc Clarkson Osborn Catalog Product Videos Custom Field Size 5/16"-18 NC Flute length 7/8" Overall length 2-23/32" Package quantity/sold as each 1 Product Reviews Write a Review Write a Review × Clarkson-Osborn 5/16"-18 NC HSSE Blue Ring Spiral Point Tap CT56405 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *