The OSG UNC Spiral Flute Threading Tap is a precision tool designed for professionals who need reliable, accurate threads in blind holes. Crafted from HSS-E cobalt and finished with a durable steam oxide coating, it delivers strong performance in demanding metalworking tasks.

• Size & Thread: 1-1/8" diameter with 7 UNC threads per inch, optimized for blind-hole applications.
• Material: HSS‑E (high-speed steel with cobalt) for enhanced hardness and heat resistance during tapping.
• Coating: Steam oxide coating provides wear resistance and reduced friction for longer tool life.
• Flute Design: Spiral flute geometry promotes efficient chip evacuation, minimizing binding in deep or narrow blind holes.
• Application: Ideal for precise threading in metals such as steel and cast iron in blind-hole scenarios.
• Quality & Consistency: Backed by OSG’s advanced threading technology to deliver accurate threads and repeatable results.

This tap helps you produce clean, accurate threads with controlled starting torque and reduced risk of cross-threading in blind holes. The combination of cobalt-enhanced HSS, steam-oxide coating, and spiral-flute geometry translates to longer tool life, improved heat management, and fewer interruptions during critical machining tasks. A reliable choice for automotive, industrial maintenance, and general fabrication projects where dependable, high-quality threads are essential.