Overview Reviews Product Description HSS General purpose BSW (British Standard Whitworth) is similar to UNC but differs in that the thread form for a BSW is 55° versus the 60° for UNC Used for threading studs, bolts and rods that require external threads Clarkson Osborn Catalog Product Videos Custom Field Size 1-1/4"-7 BSW Outer diameter 3" Package quantity/sold as each 1 Product Reviews Write a Review Write a Review × Clarkson-Osborn 1-1/4"-7 BSW x 3" HSS Round Die TA42580 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *