The OSG BSF Spiral Flute Threading Tap in 3/8-20 BSF is built for precise blind-hole threading, delivering clean, accurate threads in demanding metalwork. It’s an essential tool for machinists and fabricators who need dependable performance in fixtures, brackets, and assemblies.

• Thread size: 3/8-20 BSF (British Standard Fine) for compact, fine-pitch threads in blind holes
• Material: HSS‑E (high-speed steel with cobalt) for enhanced hardness and heat resistance
• Coating: Steam oxide coating to improve wear resistance and extend tool life in hot cutting conditions
• Flute design: Spiral flutes for efficient chip evacuation in blind-hole tapping, reducing binding
• Application: Specifically optimized for blind-hole threading and precision metalwork
• Manufacturing precision: Ground cutting edges for consistent depth control and clean, accurate threads

With this tap, you gain reliable, repeatable threads that enhance fastener performance and component alignment. The cobalt-infused HSS and steam-oxide finish resist wear and heat buildup, delivering longer life between re-sharpening or replacements. The spiral flute design helps chips clear quickly in blind-hole environments, minimizing friction and improving surface finish. This makes the OSG threading tap well-suited for production runs, repair work, or custom fabrications where accurate, durable threads matter.