The OSG BSF Spiral Flute Threading Tap is a precision tool designed for machinists who need reliable, clean threads in blind holes. Built with HSS-E cobalt and a durable steam oxide finish, it delivers longevity and consistent performance in demanding materials.

• Thread Type: BSF (British Standard Fine) spiral flute threading tap optimized for blind-hole applications.
• Material: HSS-E (high-speed steel with cobalt) for enhanced hardness and heat resistance.
• Coating: Steam oxide coating reduces wear, provides corrosion resistance, and helps with chip control.
• Flute Design: Spiral flutes promote efficient chip evacuation in confined blind-hole operations.
• Size: 5/8" diameter, 14 threads per inch (5/8-14 BSF).
• Brand Advantage: Backed by OSG’s advanced threading technology for accurate, repeatable threads and extended tool life.

Achieve precise, durable threads with less rework, thanks to a robust HSS-E core and the friction-reducing Steam Oxide finish. The spiral flute design minimizes chip buildup in blind holes, reducing the risk of tap breakage and producing smoother, more consistent threads. This tap is ideal for production runs and repair work where dependable thread quality matters across metals like steel, cast iron, and aluminum. With this tool, you’ll experience cleaner thread forms, longer life between sharpenings, and reliable performance across a range of challenging machining tasks.