The OSG UNC Spiral Flute Threading Tap is a precision tool designed for blind-hole threading, built for machinists who demand accuracy, durability, and reliable performance in metalworking projects.

• Size & Thread: 1/4" x 20 UNC threaded tap for standard coarse-threads in blind holes
• Material: HSS-E (high-speed steel with cobalt) for enhanced wear resistance and heat tolerance
• Coating: Steam oxide coating to reduce friction and extend tool life
• Flute Design: Spiral flute geometry facilitates efficient chip evacuation, minimizing binding in blind holes
• Application: Optimized for precise threading in blind-hole scenarios where clear chip removal is essential
• Brand & Technology: Utilizes OSG’s advanced threading technology to deliver consistent, high-quality threads

This tap combines cobalt-enhanced HSS-E performance with a durable steam-oxide finish to deliver consistent thread accuracy and longer tool life, even in tougher materials. The spiral flute design helps remove chips quickly, reducing the risk of tap breakage in deep, confined holes. Ideal for shops and projects where reliable, repeatable blind-hole threads are essential, this tap supports precise fastener fit and strong joint integrity across a range of common metalworking applications.