Eagle Cutting Tool C1090-108-I Cobalt Drill Bit 1-1/8 in

Product Description

The EAGLE CUTTING TOOL C1090-108-I is a cobalt screw machine (stub length) drill bit designed for high-production metal drilling applications. Built with a cobalt high-speed steel construction, this bit delivers improved heat resistance and edge retention compared to standard HSS tooling, making it well suited for harder ferrous metals, stainless steel, and abrasive alloys. The 1/2 inch straight shank allows it to seat securely in standard drill chucks and CNC machine tool holders. Machinists and metalworking professionals reach for stub-length geometry when rigidity and reduced deflection matter more than hole depth.

This drill bit is used in machine shop environments, manufacturing lines, and fabrication settings where short, rigid tooling is preferred. The screw machine length profile keeps the bit close to the chuck, minimizing runout and chatter during drilling. Typical applications include drilling through plate steel, structural steel, cast iron, and similar hard metals where a standard jobber-length bit would flex or drift. The 1-1/8 inch cutting diameter is suited for larger through-holes and clearance holes in structural or mechanical components.

Key Features

• Cobalt high-speed steel construction for increased heat and wear resistance
• Stub screw machine length for maximum rigidity and reduced deflection
• 1-1/8 inch cutting diameter for large-diameter hole applications
• 1/2 inch straight shank compatible with standard drill chucks and tool holders
• Suited for drilling hard ferrous metals, stainless steel, and abrasive alloys

Compatibility

Designed as an OEM-style replacement or production tooling option for machine shop drill presses, milling machines, and CNC machining centers equipped with 1/2 inch or larger capacity chucks.

Installation Notes

Installation and use should be performed by qualified machinists or metalworking professionals. Secure the shank fully in the chuck and verify runout before drilling. Always use appropriate cutting fluid or coolant when drilling hard metals to extend tool life and prevent overheating. Follow machine manufacturer guidelines for spindle speed and feed rate selection based on workpiece material.

Technical Specifications

• Cutting Diameter: 1-1/8 inches
• Shank Diameter: 1/2 inch
• Drill Type: Cobalt Screw Machine (Stub Length)
• Material: Cobalt High-Speed Steel
• Weight: 1.2 pounds

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: C1090-108-I