Eagle Cutting Tool C1090-053-I Cobalt Drill Bit 53/64

Product Description

The EAGLE CUTTING TOOL C1090-053-I is a 53/64 inch cobalt screw machine (stub length) drill bit with a 1/2 inch reduced shank, built for high-speed drilling through tough ferrous and non-ferrous materials. Cobalt construction gives the bit superior heat resistance compared to standard high-speed steel, making it well suited for hard alloys, stainless steel, and cast iron where standard bits lose their edge quickly. The reduced 1/2 inch shank allows this oversized bit to seat in standard 1/2 inch drill chucks without the need for a larger spindle. It is a practical, workhorse tool for machinists, toolroom techs, and fabrication professionals who need reliable hole production in production and job-shop environments.

This bit is intended for use in drill presses, milling machines, and heavy-duty hand drills equipped with a 1/2 inch chuck. The stub screw machine length geometry provides added rigidity versus jobber-length bits, reducing deflection when drilling in tight setups or on short-run production work. It is a common choice in metal fabrication shops, maintenance and repair operations, and industrial manufacturing settings where accurate, repeatable hole sizing is required.

Key Features

• Cobalt construction for extended heat resistance and edge retention in hard materials
• 53/64 inch cutting diameter for close-tolerance hole sizing
• 1/2 inch reduced shank fits standard 1/2 inch drill chucks
• Stub screw machine length geometry reduces deflection and improves rigidity
• Suitable for ferrous metals, stainless steel, cast iron, and hard alloys

Compatibility

Designed as an OEM-style replacement or direct-use cobalt drill bit for any drill press, milling machine, or heavy-duty drill with a standard 1/2 inch chuck capacity.

Installation Notes

Secure the 1/2 inch shank fully in the chuck and verify runout before beginning a cut. Use appropriate cutting fluid or coolant when drilling hard or stainless materials to preserve bit life. Always wear appropriate eye protection and secure the workpiece before drilling. Follow applicable shop safety standards and machine manufacturer guidelines for speed and feed settings.

Technical Specifications

• Cutting Diameter: 53/64 inches
• Shank Diameter: 1/2 inch
• Drill Type: Screw Machine (Stub Length)
• Material: Cobalt
• Weight: 0.69 pounds
• Minimum Order Quantity: 1

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: C1090-053-I