Eagle Cutting Tool SC400-021-D Cobalt Stub Drill 21/64

Product Description

The EAGLE CUTTING TOOL SC400-021-D is a cobalt stub drill bit sized at 21/64 inch, manufactured in the USA. Stub-length drill bits feature a shorter flute and overall length compared to jobber-length bits, which improves rigidity and reduces deflection when drilling into hard or abrasive materials. The cobalt construction adds heat resistance and hardness, making this bit suited for cutting through stainless steel, cast iron, hardened alloys, and other tough workpiece materials. Machinists, pipefitters, maintenance techs, and fabricators reach for cobalt stub drills when accuracy and tool life in difficult materials are the priority.

This drill bit is intended for use in hand-held drills, drill presses, and CNC machine tools where a 21/64-inch diameter hole is required. The stub-length geometry provides added stability in setups where minimal tool overhang is preferred, such as close-quarter drilling or applications where standard-length bits tend to walk or chatter. Domestic USA manufacture is indicated by the supplier data.

Key Features

• Cobalt construction for improved heat resistance and hardness in tough materials
• Stub-length geometry reduces deflection and improves hole accuracy
• 21/64 inch diameter for precise, consistent sizing
• USA manufactured
• Minimum order quantity of 1 unit

Compatibility

Designed as an OEM-style replacement or direct-use stub drill for standard 3-jaw drill chucks and collet systems accepting 21/64-inch shank diameters in hand drills, drill presses, and machine tool spindles.

Installation Notes

A licensed machinist or qualified tradesperson should secure the bit firmly in the chuck before operation and verify the workpiece is properly clamped or fixtured. Always power down the drill press or disconnect the tool from its power source before changing bits. Use appropriate cutting fluid or coolant when drilling hardened alloys or stainless steel to extend bit life and prevent workpiece distortion. Follow applicable shop safety standards and wear appropriate eye protection during drilling operations.

Technical Specifications

• Drill Diameter: 21/64 inch
• Drill Type: Stub Length
• Material: Cobalt
• Country of Origin: USA
• Weight: 0.95 pounds

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: SC400-021-D