Eagle Cutting Tool C1090-056-I Cobalt Drill Bit 7/8 in

Product Description

The EAGLE CUTTING TOOL C1090-056-I is a 7/8-inch cobalt screw machine (stub) length drill bit with a 1/2-inch straight shank. Cobalt high-speed steel construction provides increased heat resistance and hardness compared to standard HSS bits, making it suited for drilling hard and abrasive materials including stainless steel, cast iron, titanium, and hardened alloys. The stub-length body offers a shorter flute and overall length than a jobber-length bit, delivering greater rigidity and reduced deflection in production drilling and repair applications. This bit is used by machinists, pipefitters, ironworkers, and maintenance trades needing repeatable hole quality in tough materials.

The C1090-056-I is appropriate for use in drill presses, milling machines, and hand-held power drills equipped with a 1/2-inch chuck. Its screw machine length geometry makes it well suited for close-clearance work and CNC fixture applications where shorter tool stick-out reduces chatter. Typical applications include drilling through-holes in structural steel, pipe flanges, equipment frames, and heavy plate in both shop and field environments.

Key Features

• 7/8-inch cutting diameter in a stub screw machine length profile for added rigidity
• Cobalt high-speed steel construction resists heat buildup during high-feed or dry drilling
• 1/2-inch straight shank fits standard 1/2-inch drill chucks without adapters
• Suited for drilling hard ferrous metals, stainless steel, and abrasive alloys
• Minimum order quantity of 1 — available as a single unit

Compatibility

Designed as an OEM-style replacement or direct-use cobalt stub drill compatible with any drill press, CNC machine, or hand-held drill equipped with a 1/2-inch or larger chuck capacity.

Installation Notes

Installation and use should be performed by qualified machinists or trade professionals familiar with metalworking drill safety. Secure the workpiece firmly before drilling and use appropriate cutting fluid or coolant when drilling hard alloys to extend tool life. Inspect the bit for chipping or wear before each use. Wear appropriate eye and hand protection per applicable shop safety standards.

Technical Specifications

• Cutting Diameter: 7/8 inches
• Shank Diameter: 1/2 inches
• Drill Type: Screw Machine (Stub) Length
• Material: Cobalt High-Speed Steel
• Weight: 0.69 pounds
• Minimum Order Quantity: 1

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: C1090-056-I