The OSG UNF Spiral Flute Threading Tap is a precision tapping tool designed for blind-hole applications, delivering accurate threads with consistent results. Crafted for demanding metalworking tasks, it combines cobalt-enhanced HSS with a durable steam oxide finish to stand up to higher speeds and tougher materials.

• Thread Type: UNF (Unified National Fine) with a spiral flute geometry that promotes smooth cutting and efficient chip evacuation in blind holes.
• Size & Pitch: 7/16-20 UNF, a fine-pitch standard for precise fastener engagement in structural and mechanical assemblies.
• Material: HSS‑E (high-speed steel with cobalt) for enhanced hardness, heat resistance, and extended tap life.
• Coating: Steam oxide coating reduces friction, improves heat dissipation, and provides additional protection in challenging workshop environments.
• Flute Design: Spiral flutes optimize chip removal, minimizing clogging and extending tool life during blind-hole tapping.
• Applications: Ideal for tapping blind holes in steel, cast iron, and other common metal workpieces where access is limited.

With the OSG UNF Spiral Flute Threading Tap, you can achieve clean, accurate threads quickly and reliably. The cobalt-enhanced steel stands up to higher cutting speeds and temperatures, while the spiral flute and steam oxide coating work together to reduce wear and heat buildup. This makes it a dependable choice for production runs, repairs, and precision assemblies where consistent thread quality and long tool life matter most.