OSG Threading Tap - BSPT Spiral Flute HSS-E - Steam Oxide Coated - Blind Hole - 1/2 x 14Meet the OSG BSPT Spiral Flute Threading Tapa precision tool designed for machinists and fabrication shops that need accurate BSPT (British Standard Pipe Taper) internal threads in blind holes. Crafted from HSSE (highspeed steel with cobalt) and finished with a durable steam oxide coating, it combines longevity with reliable performance in demanding threading tasks. Size and thread type: 1 2" diameter, 14 TPI BSPT (British Standard Pipe Taper)