OSG Threading Tap - UNC Spiral Flute HSS-E - Steam Oxide Coated - Blind Hole - 3/8 x 16

The OSG UNC Spiral Flute Threading Tap in 3/8 x 16 UNC is a precision tapping solution engineered for blind-hole applications. Designed for professional machinists and fabrication shops, it delivers clean, accurate internal threads with enduring durability.

• Thread Size: 3/8" diameter, 16 TPI UNC for standard fastener compatibility
• Material: HSS-E (high-speed steel with cobalt) for superior wear resistance and heat tolerance
• Coating: Steam oxide finish reduces friction and enhances tool life in demanding environments
• Flute Design: Spiral flute geometry promotes efficient chip evacuation, especially in blind holes
• Application: Optimized for tapping internal threads in blind-hole workpieces
• Technology: Built on OSG’s advanced threading technology to ensure consistent thread quality

This tap is built to withstand the rigors of repeated use on tougher materials while maintaining precise thread formation. The spiral flute design helps pull chips out of the hole, minimizing clogging and heat buildup that can compromise thread accuracy. The combination of cobalt-enhanced HSS and a steam oxide coating delivers reliable performance, longer tool life, and smoother cutting action for critical machining tasks—from repair work in assemblies to high-volume production tapping.