Eagle Cutting Tool C1090-059-I Cobalt Drill Bit 59/64

Product Description

The EAGLE CUTTING TOOL C1090-059-I is a 59/64 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, making it well suited for prolonged drilling cycles in tough metals. The stub length geometry delivers increased rigidity and reduced deflection relative to jobber-length bits. Electricians, pipefitters, machinists, and general trade professionals use this bit in standard drill presses and heavy-duty hand drills equipped with 1/2 inch chucks.

This bit is intended for metal fabrication, HVAC, plumbing, and electrical trade applications where accurate, clean holes are required in steel, stainless steel, cast iron, and similarly hard materials. The 1/2 inch straight shank allows use in any drill press or portable drill with a 1/2 inch chuck capacity. It is equally suited for production shop environments and field service work where a short, stiff drill profile is preferred for hole accuracy and tool life.

Key Features

• 59/64 inch cutting diameter for close-tolerance hole sizing
• Cobalt construction for extended tool life in hard and abrasive metals
• Stub length body provides added rigidity and reduces bit deflection
• 1/2 inch straight reduced shank fits standard drill press and hand drill chucks
• Minimum order quantity of 1 — available as a single unit

Compatibility

Designed for use in any drill press or hand drill equipped with a 1/2 inch chuck. Suitable as a general-purpose cobalt stub drill for metal drilling applications across HVAC, plumbing, electrical, and fabrication trades.

Installation Notes

Installation of this drill bit is performed by machinists, fabricators, and trade professionals using drill presses or heavy-duty portable drills. Secure the 1/2 inch shank firmly in the chuck before operation and verify the workpiece is clamped to prevent movement. Use appropriate cutting fluid when drilling hard or stainless steel to extend bit life and maintain hole quality. Follow applicable shop safety standards and wear proper eye protection during all drilling operations.

Technical Specifications

• Cutting Diameter: 59/64 inches
• Shank Diameter: 1/2 inch
• Drill Type: Screw Machine (Stub Length)
• Material: Cobalt
• Weight: 0.69 pounds
• Minimum Order Quantity: 1

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: C1090-059-I