OSG's BSW Spiral Point Threading Tap is a precision tool designed for through-hole tapping in British Standard Whitworth threads. Crafted from HSS-E cobalt and finished with a Steam Oxide coating, it delivers reliable thread accuracy and extended tool life in demanding metalworking tasks.

• Thread Size & Type: 1/8" diameter, 40 TPI, BSW (British Standard Whitworth) for through-hole threading
• Material: HSS‑E (high-speed steel with cobalt) for improved heat resistance and durability
• Coating: Steam Oxide finish provides added wear protection and corrosion resistance
• Flute/Point Design: Spiral Point geometry facilitates efficient chip evacuation and pushes chips ahead in through-holes
• Through-Hole Compatibility: Specifically optimized for through-hole tapping to maintain alignment and thread quality
• Brand & Technology: OSG threading technology trusted by professionals for precise, clean threads and longer tool life

This tap is built to deliver consistent, high-quality BSW threads from the first cut, with chip control that minimizes cleanup time in through-holes. The cobalt-infused HSS-E composition stands up to heat during cutting, helping you complete more holes between tool changes. Steam Oxide coating adds durability in harsh workshop environments, reducing wear and helping extend the tap’s usable life. Ideal for machinists, fabricators, and technicians who regularly create through-hole BSW threads in metal components, from small enclosures to fixtures that demand precise fit and dependable performance.