The OSG UNF Spiral Point Threading Tap is a high-precision through-hole tapping solution built for machinists who demand repeatable, high-quality UNF threads and long tool life. Crafted from cobalt-containing HSS-E and finished with a durable steam oxide coating, it combines strength, heat resistance, and reliable performance in demanding production environments.

• Thread size and type: Through-hole threading for 1-1/8" diameter with 12 UNF pitch (through-hole application).
• Material: HSS-E (high-speed steel with cobalt) for enhanced hardness and heat tolerance under heavy cutting.
• Coating: Steam Oxide coating to improve wear resistance and extend service life in high-temperature tapping.
• Design: Spiral point geometry optimized for efficient chip evacuation and clean thread formation in through-holes.
• Application: Specifically engineered for through-hole tapping tasks, delivering consistent results in long runs.
• Durability: Built to maintain sharpness and accuracy over multiple uses, reducing rework and downtime.

This tap enables precise, durable threading for through-hole assemblies, helping you achieve smooth insertion of fasteners and reliable thread engagement. The combination of HSS-E substrate and steam oxide coating offers superior heat resistance and wear life, while the spiral point design minimizes chip buildup and improves cutting efficiency. Ideal for production runs and critical-machining tasks where consistent thread quality and tool longevity matter most.