Value Collection GH8780447 Counterbore 11/16 in 3 Flute

Product Description

The VALUE COLLECTION GH8780447 is a 3-flute interchangeable pilot counterbore designed for precision spotfacing and counterboring operations in metal fabrication and machining applications. Built from high speed steel with a bright uncoated finish, this tool delivers consistent cutting performance on ferrous and non-ferrous materials. The counterbore measures 11/16 inches in diameter with an overall length of 5.125 inches. The Morse taper shank designation is 2MT, providing a secure, self-holding fit in compatible spindles and drill press quills. Installation and use require a matching interchangeable pilot with a 3/16-inch pilot shank diameter. This tool is sized and configured for machinists, toolroom technicians, and maintenance professionals working on production or repair drilling operations.

This counterbore is suited for right-hand cutting applications in both manual drill press and milling machine setups. It is commonly used when a bolt head or fastener seat must be recessed flush or below a workpiece surface. The interchangeable pilot design allows the pilot tip to be swapped out for different hole sizes without replacing the body, reducing tooling cost in multi-diameter applications. Typical use environments include job shops, maintenance facilities, and production machining operations handling structural and mechanical assemblies.

Key Features

• 11/16-inch counterbore diameter for precise fastener seat sizing
• 3-flute geometry provides smooth chip evacuation and balanced cutting action
• High speed steel construction handles a broad range of workpiece materials
• 2MT Morse taper shank seats securely in standard taper-bore spindles
• Interchangeable pilot accepts 3/16-inch pilot shank diameter pilots
• Bright uncoated finish suitable for use with cutting fluids

Compatibility

Designed as a standard interchangeable pilot counterbore compatible with 2MT Morse taper spindle bores. Requires a separately sourced interchangeable pilot with a 3/16-inch shank diameter.

Installation Notes

This tool is installed and operated by machinists or toolroom technicians using a drill press, milling machine, or similar spindle-driven equipment. Power down and lock out the machine before mounting or changing the tool or pilot. Ensure the Morse taper shank and spindle bore are clean and free of chips or burrs before seating to prevent runout. Always use appropriate cutting fluid for the workpiece material to extend tool life and improve finish quality.