Achieve precise, durable BSF threads in blind holes with the OSG BSF Spiral Flute Threading Tap. Built for professional workshops and demanding machining tasks, it delivers high-quality threads and extended tool life.

• Thread size and type: 5/16-22 BSF (British Standard Fine) threading tap optimized for blind-hole applications
• Material: HSS‑E (high-speed steel with cobalt) for enhanced hardness and heat resistance
• Coating: Steam Oxide finish to improve wear resistance and corrosion protection
• Flute design: Spiral flute geometry for efficient chip evacuation in confined blind holes
• Intended use: Specifically crafted for reliable tapping in blind-hole metal components
• Manufacturer technology: Leverages OSG’s advanced threading methods to deliver consistent thread quality and longer tool life

This tapping solution reduces heat buildup and material buildup during cutting, helping you achieve clean, accurate threads with fewer reworks. The cobalt-infused HSS keeps its edge through high-speed tapping, while the steam oxide coating adds longevity in tough environments. The spiral flute design minimizes chip packing in blind holes, enabling deeper tapping and smoother operation across a range of metals. Ideal for aerospace, automotive, and general precision machining where precise British-standard threads are required.