Eagle Cutting Tool C1090-120-I Cobalt Drill Bit 1-5/16 in

Product Description

The EAGLE CUTTING TOOL C1090-120-I is a cobalt screw machine (stub length) drill bit with a 1-5/16 inch cutting diameter and a 1/2 inch reduced shank. Cobalt construction gives this bit higher heat resistance and hardness compared to standard high-speed steel, making it suitable for drilling stainless steel, cast iron, hardened alloys, and other tough materials. The stub-length body provides increased rigidity and reduced deflection in short-reach drilling applications. This bit is compatible with standard 1/2 inch drill chucks and is intended for use by machinists, pipefitters, plumbers, and other trades requiring precision large-diameter holes in hard materials.

Screw machine drill bits are commonly used in production machining, metal fabrication, and mechanical trade work where a shorter flute length is preferred for stability. The 1/2 inch shank allows this bit to seat in widely available drill press chucks, magnetic drills, and heavy-duty hand drills. It is a practical choice for drilling through structural steel, pipe flanges, and similar hard materials encountered in industrial and trade service environments.

Key Features

• 1-5/16 inch cutting diameter for large-diameter through-holes in metal
• Cobalt construction provides superior heat and wear resistance over standard HSS
• 1/2 inch reduced shank fits standard drill chucks without requiring a dedicated arbor
• Stub-length design increases rigidity and reduces bit deflection during drilling
• Import grade offering a cost-effective option for general trade and shop use

Compatibility

Designed for use in any 1/2 inch capacity drill chuck, including drill presses, magnetic base drills, and heavy-duty hand drills. No specific OEM or model compatibility is stated by the manufacturer for this bit.

Installation Notes

A licensed machinist or qualified tradesperson should operate drill bits of this diameter in a securely mounted setup such as a drill press or mag drill to prevent bit walking and workpiece movement. Always secure the workpiece with clamps or a vise before drilling. Use cutting fluid appropriate for the base material to extend bit life and maintain cut quality. Inspect the cutting edges before each use and replace the bit if chipping or excessive wear is observed.

Technical Specifications

• Cutting Diameter: 1-5/16 inches
• Shank Diameter: 1/2 inch
• Drill Type: Screw Machine (Stub Length)
• Material: Cobalt
• Weight: 1.2 pounds
• Minimum Order Quantity: 1

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: C1090-120-I