Precision internal threads for NPT pipe connections in blind holes—the OSG Spiral Flute Threading Tap is built for machinists who demand durable, accurate 3/4"-14 threads in challenging materials.

• Thread Type: NPT, 3/4"-14, designed for standard pipe fittings and leak-tight joints in blind-hole applications.
• Material: HSS-E (high-speed steel with cobalt) for exceptional hardness, wear resistance, and heat tolerance.
• Coating: Steam oxide coating to enhance wear resistance and lubricity during tapping.
• Flute Design: Spiral flutes optimize chip evacuation in blind holes, reducing clogging and improving stability.
• Application: Ideal for blind-hole tapping in steels, cast irons, and other common metals encountered in piping and hydraulic systems.
• Usage: Right-hand threading compatible with standard tapping setups and machine tools.
• Durability: Engineered for extended tool life under demanding machining tasks and repetitive production runs.

With this tap, you’ll achieve clean, accurate NPT threads that seal reliably in pipe connections. The spiral flute design keeps chips moving away from the cutting edge, minimizing heat buildup and reducing the risk of breakage in blind holes. The cobalt-enhanced HSS and steam-oxide coating work together to extend tool life, support consistent performance, and lower replacement costs across maintenance, repair, and production tasks. Whether assembling hydraulic lines, pneumatic systems, or plumbing components, this tap delivers dependable results and efficient workflow in steel, cast iron, and aluminum workpieces.