Value Collection GH8781122 Counterbore 1-3/16 in 3 Flute

Product Description

The VALUE COLLECTION GH8781122 is a 3-flute interchangeable pilot counterbore designed for precision hole finishing in metalworking applications. Built from high speed steel with a bright uncoated finish, this tool accepts interchangeable pilots and mounts via a 3MT Morse taper shank for secure, concentric seating in compatible machine spindles. At 6.375 inches overall length and 1.1875 inches in cutting diameter, it is sized for production and maintenance machining where a clean, flat-bottomed counterbore is required. Right-hand cutting direction makes it compatible with standard drill press and milling machine setups. Weight is 1.08 pounds.

This counterbore is suited for machine shops, toolrooms, and maintenance facilities performing bolt seat preparation, fastener recess work, and precision counterboring on steel, cast iron, and similar materials. The interchangeable pilot design allows a single body to serve multiple hole sizes by swapping pilots, reducing tooling inventory. The 5/16 inch pilot shank compatibility is specified for this configuration. Installation is performed by qualified machinists and tool-and-die professionals using standard Morse taper toolholders.

Key Features

• 1.1875 inch counterbore diameter for precise bolt seat and fastener recess work
• 3 flutes for efficient chip evacuation and smooth cutting action
• High speed steel construction for durability across a range of ferrous materials
• 3MT Morse taper shank for positive, concentric seating in compatible spindles
• Interchangeable pilot system accepts 5/16 inch pilot shank for flexible use
• Bright uncoated finish suitable for use with cutting fluids

Compatibility

Designed for use in drill press, milling machine, or lathe tailstock spindles accepting a No. 3 Morse taper. Compatible with interchangeable pilots having a 5/16 inch shank diameter.

Installation Notes

Installation and operation should be performed by a qualified machinist. Ensure the machine spindle is fully stopped and locked out before inserting or removing the taper shank. Seat the Morse taper firmly and verify the pilot is fully secured before engaging the workpiece. Use appropriate cutting fluid for the material being machined to extend tool life and improve finish quality.