Eagle Cutting Tool CS-3125-82-6-I Hss Countersink 82 Deg

Product Description

The EAGLE CUTTING TOOL CS-3125-82-6-I is a high-speed steel (HSS) countersink designed for creating clean, accurate countersunk holes in metal, wood, and composite materials. With a 5/16-inch cutting diameter, an 82-degree included angle, and a 6-flute design, this tool delivers smooth, chatter-free cutting with reduced burr formation. The 1/4-inch impact-drive shank makes it compatible with impact drivers and quick-change bit holders, giving technicians and tradespeople a fast setup without the need for a dedicated chuck. It is suited for production environments and field work alike.

This countersink is used wherever flathead fasteners must sit flush or below the surface of the workpiece. Common applications include sheet metal fabrication, electrical enclosure work, HVAC panel assembly, and general mechanical installations. The impact-ready shank is especially useful on job sites where an impact driver is the primary tool on hand, reducing the need to carry a separate drill or bit brace.

Key Features

• 5/16-inch cutting diameter for standard flathead screw countersinking
• 82-degree included angle matches most imperial flathead fastener standards
• 6-flute geometry reduces chatter and produces a cleaner finish than single-flute designs
• HSS construction provides durability across steel, aluminum, wood, and composite substrates
• 1/4-inch impact-drive shank compatible with quick-change holders and impact drivers

Compatibility

Designed as a replacement or addition for standard 1/4-inch hex shank quick-change bit systems and impact drivers accepting 1/4-inch drive tooling.

Installation Notes

This tool is installed and used by machinists, electricians, HVAC technicians, and general trade professionals performing fastener prep work. Secure the shank fully into the bit holder or chuck before operating. Always wear appropriate eye protection when running rotary cutting tools. Match drill speed to the substrate material — lower speeds are recommended for harder metals to extend tool life.

Technical Specifications

• Cutting Diameter: 5/16 inches
• Shank Size: 1/4 inches
• Included Angle: 82 degrees
• Number of Flutes: 6
• Drive Type: Impact (quick-change hex)
• Material: High-Speed Steel (HSS)
• Weight: 0.05 pounds

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: CS-3125-82-6-I