The OSG Metric Spiral Flute Threading Tap is built for machinists who demand precise, durable threads in blind-hole applications. Crafted from HSS-E with cobalt and finished in a steam oxide coating, it delivers reliable performance in challenging materials and extended tool life.

• Threading Type: Metric spiral flute threading tap optimized for efficient chip evacuation in blind holes.
• Size: M42 x 4.5, a metric large-diameter tap for accurate internal threads.
• Material: HSS‑E (high-speed steel with cobalt) for enhanced hardness and heat resistance.
• Coating: Steam oxide coating to improve wear resistance and reduce friction during tapping.
• Flute Design: Spiral flutes designed to carry chips out of deep blind holes for cleaner, more consistent threads.
• Durability: Engineered for repeated tapping cycles with reliable performance in demanding materials.

This tap delivers repeatable thread quality, minimizes chip packing in blind holes, and extends tool life—ideal for production environments, repair work, and precision metalworking on large metric threads. The combination of cobalt-enriched HSS-E and a steam oxide finish helps maintain performance under higher cutting temperatures, reducing downtime and rework while achieving accurate, smooth-threaded results.