The OSG UNF Spiral Flute Threading Tap is a precision tooling choice designed for blind-hole threading in metalworking projects. Built for machinists who demand consistent, accurate threads, it combines cobalt-enhanced HSS (HSS-E) with a steam oxide finish for rugged durability and reliable performance.

• Thread size and type: 5/16-24 UNF threading tap, optimized for blind-hole applications with a spiral-flute geometry that starts the thread cleanly and maintains cutting action.
• Material: HSS-E (high-speed steel with cobalt) to resist heat and wear during extended tapping operations.
• Coating: Steam oxide treatment enhances lubricity and tool life, helping minimize galling and wear in hard metals.
• Flute design: Spiral flute configuration provides efficient chip evacuation in deep or blind holes, reducing the risk of clogging and broken taps.
• Application focus: Specifically suited for precision threading in metal parts where blind-hole reliability and dimensional accuracy are critical.
• Brand and technology: Leveraging OSG’s advanced threading technology to deliver consistent, high-quality threads through demanding machining tasks.

The combination of HSS-E resistance, steam-oxide coating, and spiral-flute geometry translates to tangible benefits on the shop floor. Expect clean, dimensionally accurate UNF threads in blind holes, longer tool life under heat and friction, and more dependable performance in critical components. This tap is well-suited for aluminum, steel, and other common metals encountered in precise assemblies, helping reduce rework and downtime in production environments.