Overview Reviews Product Description HSS General purpose NPT (National Pipe Thread Tapered) - 60° thread form Used to create external pipe and conduit threads. Clarkson Osborn Catalog Product Videos Custom Field Size 1-1/2"-11.5 NPT Outer diameter 4" Package quantity/sold as each 1 Product Reviews Write a Review Write a Review × Clarkson-Osborn 1-1/2"-11.5 NPT x 4" HSS Round Die TA26696 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *