Designed for precision blind-hole threading, the OSG BSW Spiral Flute Threading Tap in 1/8 x 40 delivers clean, accurate Whitworth threads with reliability you can count on. Crafted from HSS‑E (high-speed steel with cobalt) and finished with a durable Steam Oxide coating, it’s built to resist heat and wear in demanding machining environments.

• Thread Type: BSW (Whitworth) in 1/8" diameter with 40 TPI, optimized for blind-hole applications
• Material: HSS‑E (cobalt-enhanced high-speed steel) for improved hardness and heat resistance
• Coating: Steam Oxide finish to boost wear resistance and tool life in tough metals
• Flute Design: Spiral flute geometry for efficient chip evacuation, reducing binding in deep or blind holes
• Application: Specifically suited for precision tapping of blind holes in steel and alloys, delivering consistent thread quality

With its robust HSS‑E core and steam-oxide finish, this tap maintains cutting performance under higher temperatures and heavier feeds. The spiral flute geometry aids chip clearance, minimizes torque, and lowers the risk of tap breakage when working in confined blind-hole environments. Ideal for production runs or shop tasks where reliable, accurately threaded components are essential.