Overview Reviews Product Description HSS British Standard Whitworth (BSW), British Standard Fine (BSF), and British Association (BA) thread styles These dies are suitable for cutting new threads Used for threading studs, bolts and rods that require external threads Clarkson Osborn Catalog Product Videos Custom Field Size #4 - 0.66 BA Outer diameter 0.710" Package quantity/sold as each 1 Product Reviews Write a Review Write a Review × Clarkson-Osborn #4 - 0.66 BA HSS Hex Die Nut TA81904 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *