The OSG NPT Spiral Flute Threading Tap is engineered for precise blind-hole threading, delivering reliable 1/8-27 NPT threads in metalworking projects. Built for professionals who demand consistent results, it combines robust materials with a finish designed to endure demanding tapping tasks.

• Thread type: 1/8-27 NPT blind-hole threading for pipe-thread applications
• Material: HSS‑E (high-speed steel with cobalt) for superior hardness and heat resistance
• Coating: Steam Oxide coating enhances wear life and lubricity during cutting
• Flute design: Spiral flute geometry optimizes chip evacuation in blind holes, reducing clogging
• Application: Specifically suited for accurate threading in confined blind-hole workpieces
• Size: 1/8" diameter with 27 TPI (1/8-27 NPT)

This tap helps you achieve clean, accurate threads while extending tool life. The cobalt-infused HSS core maintains sharp cutting edges under heat, and the steam-oxide finish provides durable, consistent performance across multiple taps. Its spiral flutes actively push chips out of the hole, minimizing binding and reducing the risk of thread damage in blind-hole scenarios. Ideal for precision pipe-thread tasks in metalworking environments, it supports efficient, repeatable results with reduced downtime.