Precision threading for demanding blind-hole work. The OSG UNF Spiral Flute Threading Tap delivers accurate, reliable threads with extended tool life, built for professionals who demand consistency in every critical machining task.

• Size/Thread: 1/2" diameter, 20 TPI UNF (1/2-20 UNF) for fine, strong threads in high-precision assemblies.
• Material: HSS-E cobalt alloy for increased hardness and heat resistance during tough tapping applications.
• Coating: Steam oxide coating enhances lubrication and corrosion resistance, reducing galling and wear.
• Flute Design: Spiral flute geometry promotes efficient chip evacuation in blind holes, minimizing clogging and tool breakage.
• Application: Specifically optimized for blind-hole tapping in metal parts, delivering clean, reproducible threads.
• Brand/Engineering: OSG threading technology calibrated for precision, reliability, and long tool life in professional shops.

This tap is designed to cut precise UNF threads in a variety of metals while maintaining control and consistency through every revolution. The combination of HSS-E cobalt, steam oxide coating, and spiral flutes means you can tackle deeper blind-hole taps with less fuss, fewer reworks, and longer intervals between tool changes. Ideal for production environments, job shops, and repair work where dependable, accurate threads matter most.