Eagle Cutting Tool C304-128-D Cobalt Jobber Drill No. 28

Product Description

The EAGLE CUTTING TOOL C304-128-D is a No. 28 cobalt jobber-length drill bit manufactured in the USA. Cobalt-grade construction provides increased hardness and heat resistance compared to standard high-speed steel, making this bit suitable for drilling into tough ferrous metals, stainless steel, cast iron, and similarly hard materials. The jobber-length flute geometry balances reach and rigidity for general-purpose hole-making in production and maintenance environments. Machinists, pipefitters, ironworkers, and trade professionals working with metal fabrication rely on cobalt drills for consistent performance where standard HSS bits fail prematurely.

This drill bit is suited for use in drill presses, hand-held power drills, and CNC equipment in both shop and field settings. The No. 28 wire gauge size addresses precision hole requirements common in metalworking, mechanical assembly, and tap-and-drill operations where specific clearance or thread-tap sizing is required. It is appropriate for light commercial and industrial applications wherever a small-diameter cobalt drill is needed.

Key Features

• Cobalt construction for improved heat resistance and durability in hard-metal drilling
• No. 28 wire gauge diameter for precision hole sizing and tap-drill applications
• Jobber-length flute design balances depth capacity with bit rigidity
• USA manufactured

Compatibility

Designed as an OEM-style replacement or direct-use cobalt jobber drill compatible with standard drill chucks and collet systems accepting No. 28 wire gauge shank sizes.

Installation Notes

Installation of this drill bit should be performed by qualified machinists or trade professionals familiar with proper cutting tool practices. Secure the bit fully in the chuck or collet before operation and verify runout before beginning a cut. Use appropriate cutting fluid when drilling hard metals to extend bit life and reduce heat buildup. Follow shop safety protocols including eye protection and secure workpiece fixturing.

Technical Specifications

• Drill Size: No. 28 wire gauge
• Drill Type: Cobalt Jobber
• Country of Origin: USA
• Weight: 0.42 pounds

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: C304-128-D