Eagle Cutting Tool C1090-043-I Cobalt Drill Bit 43/64

Product Description

The EAGLE CUTTING TOOL C1090-043-I is a 43/64-inch cobalt screw machine (stub length) drill bit with a 1/2-inch reduced shank, designed for drilling into hard and abrasion-resistant materials. Cobalt construction provides superior heat resistance compared to standard high-speed steel, allowing the bit to maintain cutting edge integrity at elevated temperatures generated by tough workpieces. The stub-length body reduces deflection and improves rigidity in short-reach drilling applications. This bit is a standard tool for machinists, maintenance technicians, and metalworking professionals working in shop or field environments.

This drill bit is suited for use in ferrous metals, stainless steel, cast iron, hard plastics, and other demanding materials where standard HSS bits lose performance. The 1/2-inch shank fits standard 1/2-inch drill chucks and machine spindles, making it compatible with benchtop drill presses, CNC machines, and heavy-duty hand drills. The screw machine length geometry is commonly specified in production and maintenance settings where hole accuracy and bit stability matter more than extended reach.

Key Features

• 43/64-inch cutting diameter for precise hole sizing in metalworking applications
• Cobalt construction for improved heat and wear resistance over standard HSS
• Stub-length (screw machine) body reduces flex and improves hole accuracy
• 1/2-inch reduced shank fits standard drill chucks and machine spindles
• Minimum order quantity of 1 — available as a single unit

Compatibility

Designed as a standard screw machine length cobalt drill bit compatible with any 1/2-inch drill chuck on drill presses, milling machines, CNC equipment, and heavy-duty portable drills.

Installation Notes

Install and remove only with the machine powered down and the spindle fully stopped. Secure the shank firmly in the chuck before use to prevent slipping under load. Appropriate cutting fluid or coolant is recommended when drilling hard metals to extend tool life. Always wear eye protection and follow applicable shop safety procedures when operating drill equipment.

Technical Specifications

• Cutting Diameter: 43/64 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: C1090-043-I