The OSG UNC Spiral Point Threading Tap is a purpose-built through-hole tap engineered for precision, durability, and efficiency in metalworking. Designed for professional machinists who need reliable, high-quality threads, it combines advanced materials and geometry to streamline tapping tasks.

• Size: 1-1/4" diameter, 7" overall length for through-hole applications
• Material: HSS-E (high-speed steel with cobalt) for superior hardness and heat resistance
• Coating: Steam oxide coating enhances wear resistance and lubricity in demanding metals
• Design: Spiral point geometry facilitates upward chip evacuation and efficient cutting in through holes
• Application: Specifically optimized for through-hole tapping, delivering clean, consistent threads
• Performance: Balances strength and long tool life with consistent threading quality under real-world machining conditions

This tap minimizes downtime by maintaining sharpness under higher cutting temperatures and by effectively directing chips out of the hole, reducing the risk of built-up material. The combination of cobalt-enhanced HSS and a steam oxide finish provides reliable longevity and smoother thread formation, making it well-suited for through-hole projects where precise, repeatable results matter. For best results, use proper lubrication and steady, aligned feeds to maximize thread quality and tool life.