Eagle Cutting Tool C304-121-D Cobalt Jobber Drill Size 21

Product Description

The EAGLE CUTTING TOOL C304-121-D is a size 21 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, and hardened alloys where standard high-speed steel bits fall short. The jobber-length design provides the balance of reach and rigidity that machinists, pipefitters, and maintenance technicians rely on for consistent, accurate drilling in production and field applications.

This drill bit is suited for use in metal fabrication shops, mechanical contracting, and industrial maintenance settings. Size 21 fits common fractional and numbered drill progressions used when drilling pilot holes, tap holes, and clearance holes in ferrous and non-ferrous metals. It is compatible with standard drill presses, hand drills, and magnetic-base drills that accept straight-shank bits.

Key Features

• Cobalt construction provides superior heat and wear resistance compared to standard HSS bits
• Jobber-length geometry balances reach with rigidity for accurate, chatter-free drilling
• Size 21 numbered drill sizing for precise hole diameter control
• USA manufactured for consistent quality and dimensional accuracy
• Straight shank compatible with standard drill chucks

Compatibility

Designed as a standard numbered-size cobalt jobber drill for use in any drill press, hand drill, or magnetic-base drill accepting a straight-shank bit. Suitable for drilling stainless steel, alloy steel, cast iron, and similar hard materials.

Installation Notes

Secure the bit firmly in the chuck before use and verify the shank is fully seated. Use appropriate cutting fluid or lubricant when drilling hard metals to extend bit life and improve hole quality. Wear appropriate eye protection and secure workpieces before drilling. Follow applicable shop safety standards and machine manufacturer guidelines for speed selection based on material and bit diameter.

Technical Specifications

• Drill Size: 21
• Drill Type: Jobber Length
• Material: Cobalt
• Country of Origin: USA
• Weight: 0.42 pounds
• Minimum Order Quantity: 1

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: C304-121-D