OSG UNF Spiral Flute Threading Tap in No. 4 x 48 is engineered for precise internal threading in blind holes. Crafted from HSS-E cobalt steel and finished with a durable Steam Oxide coating, it delivers reliable performance in demanding machining tasks.

• Threading standard: UNF spiral flute design optimized for fine-pitch threads and efficient chip evacuation in blind holes
• Size and length: No. 4 thread size, 48 length (overall)
• Material: High-speed steel with cobalt (HSS-E) for enhanced hardness and heat resistance
• Coating: Steam Oxide coating provides wear and corrosion protection for longer tool life
• Flute geometry: Spiral flutes improve chip removal, reducing binding and extending cutting life
• Brand and purpose: Designed by OSG for high-quality, accurate threads in critical machining tasks

This threading tap helps you achieve precise internal threads with fewer misstarts and reduced tool wear. The combination of HSS-E substrate and steam-oxide finish supports repeated use in demanding materials, while the spiral flute geometry ensures smooth chip flow from blind holes, keeping your operation efficient and consistent.