Eagle Cutting Tool C1090-124-I Cobalt Drill Bit 1-3/8 in

Product Description

The EAGLE CUTTING TOOL C1090-124-I is a cobalt screw machine (stub length) drill bit designed for drilling through tough materials including hardened steel, stainless steel, cast iron, and high-alloy metals. The 1-3/8 inch cutting diameter pairs with a 1/2 inch straight shank, making it compatible with standard drill chucks and machine spindles. Cobalt construction provides higher heat resistance than standard high-speed steel, allowing the bit to maintain a sharp cutting edge under heavy feed rates and elevated cutting temperatures. This bit is well suited for production drilling environments where tool longevity and dimensional accuracy are priorities.

The C1090-124-I is used in machine shop, maintenance, and industrial fabrication settings. Screw machine length geometry means a shorter flute and body compared to jobber-length bits, which increases rigidity and reduces deflection during drilling operations. Typical applications include drilling structural steel, pipe, plate, and heavy-gauge tubing. This bit is installed and operated by machinists, pipefitters, ironworkers, and maintenance mechanics working with drill presses, milling machines, magnetic drills, and heavy-duty hand drills.

Key Features

• 1-3/8 inch cutting diameter for large-hole applications in metal
• Cobalt alloy construction resists heat buildup during high-feed drilling
• 1/2 inch straight shank fits standard drill chucks and machine spindles
• Screw machine (stub) length body increases rigidity and reduces bit deflection
• Suitable for hardened steel, stainless steel, cast iron, and high-alloy workpieces

Compatibility

Designed for use in drill presses, milling machines, magnetic base drills, and heavy-duty hand drills equipped with a 1/2 inch or larger chuck capacity. Suitable as a replacement or supplemental drill bit wherever a 1-3/8 inch cobalt screw machine drill is specified.

Installation Notes

Secure the 1/2 inch shank firmly in the chuck and verify runout before drilling. Always apply appropriate cutting fluid when drilling hardened or stainless steel to extend tool life and maintain hole quality. Operate at the correct surface footage and feed rate for cobalt tooling and the workpiece material — consult a speeds-and-feeds reference chart before use. Wear appropriate PPE including safety glasses and secure the workpiece before starting the cut.

Technical Specifications

• Cutting Diameter: 1-3/8 inches
• Shank Diameter: 1/2 inch
• Drill Style: Screw Machine (Stub) Length
• Material: Cobalt High-Speed Steel
• Weight: 1.2 pounds
• Minimum Order Quantity: 1

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: C1090-124-I