The OSG BSF Spiral Point Threading Tap in HSS-E with steam oxide coating is built for through-hole tapping, delivering precise British Standard Fine threads with enduring reliability. It’s designed for machinists who value accuracy, durability, and efficient cycle times in metalworking projects.

• Threading type & size: BSF (British Standard Fine) spiral point threading tap for through-holes, 1-1/8" diameter, 9 TPI.
• Material: High-Speed Steel with cobalt (HSS-E) for enhanced hardness and heat resistance under demanding cutting conditions.
• Coating: Steam oxide coating to reduce friction, improve wear resistance, and extend tool life in tough metals.
• Geometry: Spiral point design that pushes chips forward, enabling efficient chip evacuation and smoother tapping in through holes.
• Application: Specifically optimized for through-hole tapping, helping maintain straight, clean threads with consistent quality.

This tap helps you achieve accurate BSF threads with fewer reworks and longer tool life. The combination of HSS-E material and steam oxide coating reduces heat buildup and wear, making it suitable for repetitive, high-precision tapping tasks in steel and similar alloys. The spiral point geometry minimizes chip recutting, supports faster cycle times, and delivers a reliable thread profile critical for fasteners and assemblies that demand snug, dependable engagement.