The OSG UNC Spiral Point Threading Tap No. 4 x 40 is a precision threading tool designed for through-hole applications, delivering clean, accurate UNC threads with reliable tool life. Built from cobalt-infused HSS-E and finished with a steam oxide coating, it’s engineered for demanding machining environments.

• Thread Type: UNC spiral point design optimized for through-hole tapping, promoting efficient thread formation.
• Material: HSS-E (high-speed steel with cobalt) for enhanced hardness and heat resistance.
• Coating: Steam oxide finish to improve wear resistance and corrosion protection in tough shop conditions.
• Chip Evacuation: Spiral point geometry directs chips forward, reducing clogging in through-holes and improving cycle efficiency.
• Size: No. 4 x 40 UNC threading tap, suitable for standard through-hole fastener work.
• Application: Ideal for tapping threads in steel, stainless steel, aluminum, and other metals found in production and repair environments.

This tap is crafted for professionals who need consistent, high-quality UNC threads without frequent tool changes. The cobalt-enhanced HSS-E provides superior edge retention under high cutting speeds, while the steam oxide coating extends usable life in challenging materials and coolant-heavy setups. The result is precise threads, fewer reworks, and a dependable option for through-hole assemblies in machining shops, maintenance departments, and job shops.