OSG UNF Spiral Flute Threading Tap is crafted for precision blind-hole threading, designed for machinists who value consistent, high-quality threads. Built from cobalt-enhanced high-speed steel (HSS-E) and finished with a steam oxide coating, it delivers durability and heat resistance in tough materials.

• Thread size: UNF 1 x 12
• Material: HSS‑E (high-speed steel with cobalt) for enhanced wear resistance and heat tolerance
• Coating: Steam oxide finish reduces friction and increases tool life in cutting environments
• Flute style: Spiral flutes designed to evacuate chips quickly, especially effective in blind holes
• Application: Optimized for blind-hole tapping in steel, cast iron, and other challenging workpieces
• Drive/ interface: Square tang for use with standard hand taps or tapping wrenches
• Performance: Delivers accurate thread geometry, maintains hole integrity, and extends tool life in demanding applications

With this tap, you achieve clean, accurately formed threads in blind holes, thanks to the spiral flute geometry that evacuates chips efficiently and reduces the risk of binding. The HSS‑E cobalt composition maintains sharpness under heavier cutting conditions, while the steam oxide coating lowers friction and resists wear in coolant environments. This makes it a reliable choice for automotive, aerospace, and precision manufacturing tasks where dependable threading matters. For best results, use proper lubrication, steady feeds and speeds, and a light final pass to preserve thread quality and tool longevity.