OSG Threading Tap - UNF Spiral Flute HSS-E - Steam Oxide Coated - Blind Hole - 1/4 x 28

The OSG UNF Spiral Flute Threading Tap is a precision threading tool designed for blind-hole applications, delivering clean, accurate threads in 1/4" x 28 UNF. Built for machinists and fabrication shops, it combines durable materials with a flute geometry that enhances cutting efficiency and reliability.

• Thread Size and Type: UNF threading, 1/4" diameter with 28 threads per inch for fine-pitch, high-precision results.
• Material: HSS-E (high-speed steel with cobalt) for superior hardness and heat resistance during cutting.
• Coating: Steam Oxide coating adds durability and corrosion resistance in challenging machining environments.
• Flute Design: Spiral flutes provide efficient chip evacuation, reducing clogging when threading in blind holes.
• Application: Specifically optimized for blind-hole threading, yielding consistent thread quality and extended tool life.

This tapping solution helps you achieve robust, accurately formed threads that improve part mating and reduce rework. The cobalt-enhanced core withstands heat and friction, while the steam-oxide coating extends tool life in demanding cuts. The spiral flute design keeps chips moving out of the hole, minimizing wear and enabling reliable performance on critical machining tasks, prototypes, and ongoing production work where precision matters.