Overview Reviews Product Description HSS General purpose BSF (British Standard Fine) is a finer pitch series, also with a 55° degree thread form Used for threading studs, bolts and rods that require external threads Clarkson Osborn Catalog Product Videos Custom Field Size 3/8"-20 BSF Outer diameter 1-5/16" Package quantity/sold as each 1 Product Reviews Write a Review Write a Review × Clarkson-Osborn 3/8"-20 BSF x 1-5/16" HSS Round Die TA43224 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *