Eagle Cutting Tool C1080-040-D Cobalt Drill Bit 5/8 in

Product Description

The EAGLE CUTTING TOOL C1080-040-D is a cobalt screw machine (stub) length drill bit with a 5/8 inch cutting diameter and a 1/2 inch reduced shank. Manufactured in the USA, cobalt high-speed steel construction provides increased heat and wear resistance compared to standard HSS tooling, making this bit suited for drilling hard and abrasive materials including stainless steel, cast iron, and hardened alloys. The screw machine length profile offers a shorter flute for increased rigidity and reduced deflection in tight clearance applications. Licensed tradespeople and machinists reach for stub-length cobalt drills when standard jobber-length bits flex too much or lack the stiffness the job demands.

This drill bit is used in machine shop, fabrication, and on-site trade applications where a rigid, heat-resistant drill is required. The 1/2 inch shank accommodates standard 1/2 inch drill chucks and keyed chuck adapters common on benchtop drill presses, magnetic drills, and heavy-duty hand drills. Typical applications include drilling through structural steel, stainless pipe, and other ferrous metals encountered in HVAC, plumbing, and electrical rough-in work. The reduced shank allows the 5/8 inch cutting diameter to run in a standard 1/2 inch capacity chuck without requiring a larger machine.

Key Features

• Cobalt high-speed steel construction for superior heat and wear resistance in hard metals
• Screw machine (stub) length design increases rigidity and reduces deflection
• 5/8 inch cutting diameter with 1/2 inch reduced shank fits standard 1/2 inch chucks
• Made in the USA
• Minimum order quantity of 1 unit — available as a single bit

Compatibility

Designed for use in any 1/2 inch keyed or keyless drill chuck on drill presses, magnetic base drills, and heavy-duty portable drills. Suited for ferrous metals, stainless steel, cast iron, and other hard materials where cobalt tooling is specified.

Installation Notes

Secure the 1/2 inch shank firmly in the chuck before operation and verify the bit runs true with no noticeable wobble. Use cutting fluid or cutting oil when drilling stainless steel or hard alloys to extend tool life and reduce heat buildup. Reduce feed pressure as the drill breaks through the workpiece to prevent grabbing or bit breakage. Inspect the cutting edges for chipping or heat discoloration before each use.

Technical Specifications

• Cutting Diameter: 5/8 inch
• Shank Diameter: 1/2 inch
• Drill Type: Screw Machine (Stub) Length
• Material: Cobalt High-Speed Steel
• Country of Origin: USA
• Weight: 0.69 pounds

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: C1080-040-D