OSG Threading Tap - UNC Spiral Flute HSS-E - Steam Oxide Coated - Blind Hole - 7/8 x 9

The OSG UNC Spiral Flute Threading Tap in 7/8-9 requires precision for blind-hole threading, delivering clean, accurate threads with extended tool life. Built for professional shops and serious hobbyists alike, it combines durability with reliable performance in demanding metalworking tasks.

• Thread size: UNC 7/8-9, designed for standard Unified Coarse threading in blind-hole applications.
• Material: HSS-E (high-speed steel with cobalt) for enhanced hardness and heat resistance during tapping.
• Coating: Steam Oxide finish provides wear protection and improved lubricity to help extend tool life.
• Flute design: Spiral flute geometry optimizes chip evacuation in blind holes, reducing tapering and pulling forces during tapping.
• Application: Ideal choice for precise threading in blind-hole metalworking, supporting consistent thread form in tough materials.
• Technology: Built on OSG’s advanced threading technology to deliver high-quality, accurate threads with durable performance in production environments.

This threading tap helps machinists achieve reliable, repeatable results by maintaining thread integrity through efficient chip clearance and robust wear resistance. Its cobalt-enhanced alloy and oxide coating work together to withstand the heat and friction of heavy tapping, minimizing tool wear and rework. Use it for precision fastener threads in critical components where accurate pitch and clean, square threads are essential, and rely on its design to maintain consistency across production runs.