Overview Reviews Product Description HSS Designed to produce a 2B class of fit Spiral point forces the chips ahead of the tap - designed for through hole applications Bright finish for tapping a wide range of materials but best suited for non-ferrous materials such as aluminum The untreated surface on this tap gives lower friction and good chip flow for softer materials Clarkson Osborn Catalog Product Videos Custom Field Size #4-40 NC Flute length 5/8" Overall length 1-7/8" Package quantity/sold as each 1 Product Reviews Write a Review Write a Review × Clarkson-Osborn #4-40 NC HSS Bright Wizard® Spiral Point Machine Tap CT77004 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *