Norseman Drill and Tool Type 24-RNC Fractional M42 Cobalt Bright Finish Plug Tap

Norseman Drill & Tool Type 24-RNC Fractional M42 Cobalt Plug Taps

High-Strength Threading for Hardened and Abrasive Materials

The Norseman Drill & Tool Type 24-RNC Fractional M42 Cobalt Bright Finish Plug Tap is engineered for precision threading in tough, wear-intensive materials. Built from premium M42 cobalt high-speed steel, these plug taps deliver exceptional hot hardness, edge strength, and durability—making them the go-to choice for production and maintenance operations working with hardened steels.

M42 Cobalt Construction for Hardened Steels

Reliable Performance from Rc 30–45

Type 24-RNC plug taps are specifically designed for through-hole tapping in mold steel and hardened steel with Rockwell C hardness between C30 and C45. The cobalt alloy increases red-hardness and wear resistance, allowing the tap to maintain sharp cutting edges under heat and load. This translates to consistent thread geometry, reduced tool changes, and improved uptime.

Plug Tap Geometry for Through Holes

Clean Threads and Efficient Chip Flow

The plug tap profile offers an optimal balance of lead length and cutting engagement, making it ideal for through-hole applications. This geometry promotes smooth cutting action, controlled chip formation, and accurate thread depth—delivering dependable results in CNC machining and conventional shop environments.

Bright Finish and Titanium-Coated Options

Smooth Cutting and Extended Tool Life

The bright finish provides low friction and excellent surface integrity when threading a variety of materials. For even greater performance, titanium-coated M42 plug taps are available and are proven to last up to twice as long as uncoated taps. The titanium coating adds lubricity and surface hardness, producing smoother threads while reducing galling and heat buildup.

Versatility Across Materials

Beyond Hardened Steel

In addition to hardened and mold steels, Type 24-RNC taps perform reliably in cast iron, brass, bronze, armor plate, and hard plastics, making them a versatile solution for mixed-material shops and demanding industrial applications.

Key Features

• Fractional sizes for standard inch threading

• M42 cobalt HSS for superior wear resistance

• Plug tap geometry for through-hole applications

• Bright finish for smooth cutting; titanium-coated option for extended life

• Designed for steels C30–C45 Rc and other abrasive materials

For strength, precision, and long tool life in hardened materials, Norseman Drill & Tool Type 24-RNC M42 Cobalt Plug Taps deliver professional-grade performance you can trust.