Precision threading for professionals—OSG's UNC Spiral Flute Threading Tap in 5/16 x 18 UNC is built for blind-hole tapping where accuracy and durability matter most. Crafted from HSS-E cobalt and finished with a Steam Oxide coating, it delivers reliable performance in challenging materials and tight spaces.

• Thread Size & Type: 5/16-18 UNC spiral flute threading tap designed for blind-hole applications, delivering consistent thread geometry.
• Material & Coating: HSS-E cobalt alloy with a Steam Oxide coating for outstanding wear resistance and heat tolerance.
• Flute Design: Spiral flutes promote efficient chip evacuation, reducing buildup in blind holes and enabling smoother tapping.
• Application & Use: Optimized for blind-hole tapping in metalworking tasks, from maintenance to production runs.
• Compatibility: Designed for use with standard tapping setups and both hand and machine tapping operations.
• Durability & Finish: Steam Oxide finish provides corrosion resistance and minimizes friction for longer tool life.

With this tap, you gain precise and repeatable thread engagement in blind holes, reduced risk of thread damage, and extended tool life thanks to the cobalt-enhanced HSS and durable coating. The spiral flute design keeps chips moving away from the cutting edge, minimizing heat buildup and improving surface finish. It’s ideal for automotive, fabrication, and general machining tasks that require reliable 5/16-18 UNC threads in blind holes.