Introducing the OSG BA Spiral Point Threading Tap in 4BA — a precision tool built for through-hole BA threading. Designed for machinists and precision assemblies, it delivers consistent, high-quality threads with reliable longevity.

• Thread form: BA spiral point threading tap for British Association thread standards, optimized for through-hole applications.
• Size: 4BA, a compact, common BA size ideal for small-diameter fasteners and delicate assemblies.
• Material: HSS-E (high-speed steel with cobalt) for enhanced hardness and wear resistance under demanding cutting conditions.
• Coating: Steam Oxide Coated Plus finish to improve heat tolerance and abrasion resistance during prolonged use.
• Cutting geometry: Spiral point design promotes efficient chip evacuation, reducing clogging and helping to prevent thread distortion.
• Application: Specifically engineered for through-hole BA threads, providing precise alignment and clean, repeatable results.

This tap combines cobalt-enriched HSS with a durable Steam Oxide Coated Plus finish to maintain cutting performance as temperatures rise, extending tool life on tough materials. The spiral point geometry pushes chips ahead of the cutting edge, enabling smoother operation and faster cycle times in through-hole work. Ideal for small-scale projects, instrument housings, electronics enclosures, and any application requiring reliable BA threads with tight tolerances.