The OSG BA Spiral Flute Threading Tap is a precision tapping solution designed for blind-hole applications that require exact 4BA British Association threads. Crafted from cobalt-enriched high-speed steel (HSS-E) and finished with Steam Oxide Coated Plus, it combines durability with reliable heat resistance for demanding machining tasks.

• Size: 4BA thread for compact, precise fittings in small assemblies
• Material: HSS-E (high-speed steel with cobalt) for improved hardness and wear resistance
• Finish: Steam Oxide Coated Plus for enhanced corrosion resistance and heat tolerance
• Cutting geometry: Spiral flute design that promotes efficient chip evacuation in blind holes
• Application: Optimized for blind-hole threading where space is limited and accuracy matters
• Technology: Supported by OSG’s advanced threading technology for consistent thread quality and extended tool life

This combination delivers clean, accurate threads with minimal tool wear and dependable performance in challenging, confined threading tasks. The spiral flute helps chips clear quickly, reducing the risk of binding and heat buildup in blind holes, while the durable HSS-E substrate and protective oxide finish extend tool life and reliability across multiple jobs. Ideal for precision assemblies, electronics housings, and small mechanical components where tight tolerances and repeatable results are essential.