Eagle Cutting Tool C1090-039-I Cobalt Drill Bit 39/64 in

Product Description

The EAGLE CUTTING TOOL C1090-039-I is a 39/64-inch cobalt screw machine (stub length) drill bit with a 1/2-inch reduced shank. Cobalt construction provides added heat resistance and edge retention compared to standard high-speed steel, making this bit suitable for drilling tough materials including stainless steel, cast iron, and hard alloys. The stub-length body offers increased rigidity and reduced deflection during drilling operations. Licensed tradespeople and machinists working in fabrication, mechanical contracting, and maintenance applications rely on screw machine drills where chuck clearance or depth constraints call for a shorter flute length.

This drill bit is intended for use in drill presses, CNC machines, lathes, and hand-held power drills equipped with a 1/2-inch or larger chuck. It is well-suited for production drilling and on-site metalworking in HVAC, plumbing, electrical, and general mechanical trade applications where hard or abrasive metals are encountered. The 39/64-inch diameter is a common size for stepped hole preparation and tap-clearance drilling in metal fabrication workflows.

Key Features

• Cobalt alloy construction for improved heat resistance and durability in hard-metal drilling
• Stub screw machine length increases rigidity and reduces bit deflection
• 1/2-inch reduced shank fits standard 1/2-inch and larger drill chucks
• 39/64-inch cutting diameter for precise hole sizing in metal stock
• Suitable for stainless steel, cast iron, hard alloys, and other demanding materials

Compatibility

Designed as an OEM-style replacement or standard supply bit for use in any drill press, CNC drilling machine, or power drill with a 1/2-inch or larger chuck capacity accepting a 1/2-inch shank screw machine drill bit.

Installation Notes

Installation of this drill bit should be performed by qualified tradespeople following standard machine-shop or on-site metalworking safety practices. Ensure the drilling machine is fully powered down and the chuck is secured before inserting or removing the bit. Use appropriate cutting fluid or coolant when drilling hard metals to prolong bit life and maintain hole quality. Eye protection and proper workpiece clamping are required during all drilling operations.

Technical Specifications

• Cutting Diameter: 39/64 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: C1090-039-I