OSG UNC Spiral Flute Threading Tap in HSS-E cobalt delivers precise internal threads for blind-hole applications. Built for professional machinists and production shops, it pairs durability with reliable performance to tackle demanding threading tasks.

• Thread size and type: 5/8" x 11 UNC threading tap designed for standard coarse internal threads in blind holes.
• Material: High-speed steel with cobalt (HSS-E) for superior hardness and heat resistance under cutting loads.
• Coating: Steam oxide coating provides wear protection and lubricity to extend cutting life.
• Flute design: Spiral flute geometry optimizes chip evacuation in blind-hole operations, reducing clogging and breakage.
• Application: Specifically engineered for blind-hole threading in metalworking projects, fixtures, and assemblies.
• Durability and longevity: Built to endure repetitive use and higher cutting speeds, delivering extended tool life and consistent results.
• Technology: Backed by OSG’s advanced threading technology for dependable, high-quality threads every time.

When you use this tap, you get clean, true threads with less rework. The spiral flute design helps clear chips quickly in blind holes, minimizing the risk of jamming and extending tool life. The HSS-E cobalt construction stands up to heat and wear, while the steam oxide coating adds lubricity and protection, enabling reliable performance across production runs. Ideal for critical threading tasks where consistency matters, this tap supports fixture builds, repairs, and maintenance work with confidence.