OSG Threading Tap - BSW Spiral Flute HSS-E - Steam Oxide Coated - Blind Hole - 9/32 x 20

The OSG BSW Spiral Flute Threading Tap in 9/32 x 20 is engineered for precise blind-hole tapping in metal, delivering clean, accurate threads with consistent performance. Designed for professional machinists and shop environments, it combines durability, heat resistance, and efficient chip evacuation to tackle demanding projects.

• Threading standard: BSW (British Standard Whitworth), 9/32" diameter with 20 TPI, optimized for compatible components and fixtures.
• Flute design: Spiral flutes engineered for efficient chip evacuation in blind holes, reducing binding and improving completion reliability.
• Material and coating: HSS-E (high-speed steel with cobalt) paired with a steam oxide coating for enhanced wear resistance and heat tolerance.
• Application: Ideal for blind-hole tapping in harder metals and alloys where access is from one end is limited.
• Durability: Cobalt-enriched substrate and protective oxide finish extend tool life under demanding cutting conditions.
• Manufacturer: Part of OSG’s precision threading lineup, built for consistent thread quality and long service life.

With this tap, you’ll achieve crisp, uniform threads and reduce the risk of breakage in tough materials. The spiral flute design helps chips clear quickly, minimizing tool clogging in tight blind holes and allowing smoother operation. The cobalt-enhanced HSS and steam oxide coating pair to resist wear and heat, helping maintain thread accuracy across batches. This makes it a dependable choice for automotive, machinery, and fabrication work where reliable, repeatable tapping matters. For best results, pair with proper cutting fluid and use appropriate tapping speeds to maximize tool life and finish quality.