Eagle Cutting Tool C1090-116-I Cobalt Drill Bit 1-1/4 in

Product Description

The EAGLE CUTTING TOOL C1090-116-I is a 1-1/4 inch cobalt slow spiral (screw machine) drill bit with a 1/2 inch reduced shank. Cobalt construction gives the cutting edge greater heat resistance than standard high-speed steel, making it well suited for drilling hard and abrasive materials without rapid edge breakdown. The reduced 1/2 inch shank allows use in standard drill chucks without requiring oversized spindle tooling. This bit is intended for professional machinists, fabricators, and tradespeople working in metal fabrication, maintenance, and general industrial drilling applications.

The C1090-116-I is used in stationary drilling operations on drill presses and milling machines as well as heavy-duty hand drilling setups where a 1/2 inch chuck is available. It is suited for drilling ferrous metals including steel, cast iron, and stainless steel, and performs in both production shop environments and field maintenance situations where aggressive material removal is required.

Key Features

• Cobalt alloy construction for improved heat and wear resistance over standard HSS
• 1-1/4 inch cutting diameter for large-bore through-holes in a single pass
• 1/2 inch reduced shank fits standard 1/2 inch drill chucks and tooling
• Slow spiral geometry promotes chip clearance in deep-hole drilling applications
• Suitable for ferrous metals and hard abrasive materials

Compatibility

Designed as an OEM-style replacement or direct-use large-diameter cobalt drill bit for use in any drill press, milling machine, or portable drill accepting a 1/2 inch shank.

Installation Notes

Secure the 1/2 inch shank firmly in the drill chuck and verify runout before drilling. Use appropriate cutting fluid or coolant when drilling hard ferrous materials to extend tool life and improve cut quality. Always wear appropriate PPE including eye protection when operating rotary cutting tools. Follow machine manufacturer guidelines for feed rate and spindle speed appropriate to the workpiece material and drill diameter.

Technical Specifications

• Cutting Diameter: 1-1/4 inches
• Shank Diameter: 1/2 inch
• Material: Cobalt alloy
• Weight: 1.2 pounds
• Minimum Order Quantity: 1

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: C1090-116-I