OSG Threading Tap - NPT Spiral Flute HSS-E - Steam Oxide Coated - Blind Hole - 1/2 x 14The OSG 1 2 x 14 NPT Spiral Flute Threading Tap is a precision internal threading tool designed for blind hole work in metal and other machinable materials. Built with HSS E cobalt and finished with a durable steam oxide coating, it delivers consistent, accurate threads and extended tool life for demanding piping, hydraulic, and mechanical assemblies. Size & Thread: 1 2" diameter, 14 threads per inch (NPT) for precise internal threading in blind