Eagle Cutting Tool C1080-055-D Cobalt Drill Bit 55/64

Product Description

The EAGLE CUTTING TOOL C1080-055-D is a 55/64-inch cobalt screw machine (stub length) drill bit with a 1/2-inch reduced shank, manufactured in the USA. Cobalt high-speed steel construction provides elevated heat resistance and edge retention compared to standard HSS bits, making it well suited for drilling hard ferrous metals, stainless steel, cast iron, and other abrasive materials. The stub-length body offers increased rigidity and reduced deflection, which is critical when accuracy and hole quality matter in production or maintenance environments. The reduced 1/2-inch shank allows the bit to seat in standard 1/2-inch chucks without requiring a larger machine spindle.

This drill bit is used in metal fabrication shops, maintenance and repair operations, machine shops, and industrial production settings. It is a strong fit for applications where standard jobber-length bits flex or walk, particularly when drilling into tough alloys or thick plate stock. Electricians, pipefitters, millwrights, and general maintenance technicians reach for stub-length cobalt bits when close-quarter clearance or maximum rigidity is the priority. The USA-made designation indicates domestic manufacturing, which is a common specification requirement on government and contractor work orders.

Key Features

• Cobalt high-speed steel construction for superior heat and wear resistance in hard metals
• Stub screw machine length body reduces flex and deflection for improved hole accuracy
• 1/2-inch reduced shank fits standard 1/2-inch drill chucks and press spindles
• 55/64-inch cutting diameter for precise hole sizing without secondary reaming on many applications
• USA manufactured to meet domestic procurement and quality specifications

Compatibility

Designed as a standard screw machine drill bit compatible with any drill press, milling machine, or hand drill equipped with a 1/2-inch or larger chuck capacity.

Installation Notes

This bit is installed and operated by machinists, maintenance technicians, and trade professionals using drill presses, magnetic drills, or heavy-duty hand drills. Always secure the workpiece before drilling and use appropriate cutting fluid when boring hard or stainless alloys to extend tool life. Inspect the cutting edges for wear or chipping before each use and replace the bit if the edge is degraded. Follow machine manufacturer guidelines for spindle speed selection based on material type and drill diameter.

Technical Specifications

• Cutting Diameter: 55/64 inches
• Shank Diameter: 1/2 inch
• Drill Style: Screw Machine (Stub Length)
• Material: Cobalt High-Speed Steel
• Country of Origin: USA
• Weight: 0.69 pounds
• Minimum Order Quantity: 1

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: C1080-055-D