OSG Threading Tap - BSPT Spiral Flute HSS-E - Steam Oxide Coated - Blind Hole - 1/4 x 19The OSG BSP Spiral Flute Threading Tap is a precision tool designed for machinists needing accurate BSPT threads in blind holes. Crafted from HSS E cobalt and finished with a Steam Oxide coating, it delivers durable performance and steady cutting reliability in tight workspaces. Thread type: BSPT (British Standard Pipe Taper) threading, 1 4" nominal size with 19 TPI, optimized for blind hole applications. Material: HSS E (high speed steel with cobalt)