Eagle Cutting Tool C1090-047-I Cobalt Drill Bit 47/64 in

Product Description

The EAGLE CUTTING TOOL C1090-047-I is a 47/64-inch cobalt screw machine (stub) length drill bit with a 1/2-inch straight shank. Cobalt construction provides increased heat resistance and hardness compared to standard high-speed steel, making this bit suitable for drilling through stainless steel, cast iron, high-nickel alloys, and other hard-to-machine materials. The screw machine length body is shorter than a jobber-length bit, which reduces deflection and improves rigidity in tight-clearance setups. Machinists, pipefitters, and maintenance technicians install this bit in drill presses, CNC machines, and magnetic drills where a 1/2-inch chuck is standard.

The C1090-047-I is used in industrial and commercial fabrication environments where materials resist standard HSS tooling. Typical applications include drilling bolt-clearance holes, enlarging existing holes before reaming, and production drilling in metal plate and structural stock. The 47/64-inch diameter is a common pre-ream size in metalworking and mechanical construction trades. The 1/2-inch shank accommodates standard drill press and machine tool chucks without requiring a reduction sleeve.

Key Features

• 47/64-inch cutting diameter for bolt-clearance and pre-ream applications
• Cobalt construction for improved heat resistance over standard HSS bits
• Screw machine (stub) length body reduces deflection in rigid setups
• 1/2-inch straight shank fits standard machine tool and drill press chucks directly
• Suitable for hard and abrasive materials including stainless steel and cast iron

Compatibility

Designed as a standard 1/2-inch shank screw machine drill bit for use in drill presses, CNC drilling machines, and magnetic drills equipped with a 1/2-inch or larger chuck.

Installation Notes

Install in a properly sized chuck and tighten securely before operation. Use appropriate cutting fluid or coolant when drilling hard metals to extend tool life and prevent heat buildup. Inspect the cutting edges for wear or chipping before each use. Follow applicable machine guarding and personal protective equipment requirements per OSHA and shop safety standards.

Technical Specifications

• Cutting Diameter: 47/64 inches
• Shank Diameter: 1/2 inch
• Drill Type: Screw Machine (Stub) Length
• Material: Cobalt
• Weight: 0.69 pounds

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: C1090-047-I