Eagle Cutting Tool C300-031-D Cobalt Jobber Drill 31/64

Product Description

The EAGLE CUTTING TOOL C300-031-D is a 31/64-inch cobalt jobber-length drill bit manufactured in the USA. Cobalt construction gives this bit the heat resistance and hardness needed to cut through tough materials including stainless steel, cast iron, high-nickel alloys, and hardened steel. The jobber-length flute geometry balances reach and rigidity, making it a reliable choice for production drilling, maintenance shops, and job-site use. Machinists, pipefitters, ironworkers, and maintenance technicians reach for cobalt bits when standard high-speed steel bits wear prematurely or overheat under sustained cutting loads.

This bit fits standard 3-jaw drill chucks and is suited for both handheld and drill-press applications. The 31/64-inch diameter is commonly used for clearance holes, pilot holes ahead of tapping, and dimensional drilling in fabrication and mechanical work. Its USA manufacture supports consistent metallurgical quality and dimensional tolerance, which matters in production environments where bit-to-bit consistency affects cycle time and tool life.

Key Features

• Cobalt construction for superior heat resistance and extended tool life in hard metals
• 31/64-inch diameter for precise clearance and tapping applications
• Jobber-length flute design balances reach with torsional rigidity
• Manufactured in the USA for consistent metallurgical quality
• Compatible with standard 3-jaw drill chucks on handheld drills and drill presses

Compatibility

Designed as an OEM-style replacement and standard-use cobalt jobber drill bit compatible with any 3-jaw drill chuck accepting a 31/64-inch shank diameter.

Installation Notes

Secure the bit fully in the chuck and verify chuck key is removed before operation. Use cutting fluid or lubricant when drilling stainless steel, high-nickel alloys, or other hard metals to reduce heat buildup and extend bit life. Allow the bit to cool between extended drilling operations to prevent annealing of the cobalt flutes. Inspect the cutting edges regularly and replace the bit when wear causes overheating or dimensional drift.

Technical Specifications

• Diameter: 31/64 inch
• Drill Type: Jobber Length
• Material: Cobalt
• Country of Origin: USA
• Weight: 1.2 pounds

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: C300-031-D