Value Collection GH8815441 Counterbore 11/16 in 3 Flute Cobalt

Product Description

The VALUE COLLECTION GH8815441 is a 3-flute interchangeable pilot counterbore designed for creating flat-bottomed recesses around drilled holes to seat fastener heads flush or below a workpiece surface. Built from cobalt steel with a bright, uncoated finish, this tool delivers heat and wear resistance suitable for cutting harder ferrous and non-ferrous materials. The straight shank measures 1/2 inch in diameter and 3-7/8 inches in length, with an overall length of 5-1/8 inches. Right-hand cutting geometry and a 3-flute configuration provide clean, stable material removal. Machinists and toolroom professionals are the primary users of this counterbore in production and maintenance drilling operations.

This counterbore is suited for machine shop, aerospace maintenance, and industrial fabrication environments where precise fastener seating is required. The interchangeable pilot design accepts a 3/16-inch pilot shank, allowing the tool to follow an existing drilled hole for accurate concentricity. Typical applications include spotfacing and counterboring operations on steel, stainless, cast iron, and other hard materials where cobalt tooling is specified. It is used in manual milling machines, drill presses, and CNC machining centers with appropriate toolholding.

Key Features

• Cobalt steel construction for improved heat resistance and tool life in hard materials
• 3-flute design for smooth cutting action and chip evacuation
• Interchangeable pilot accepts a 3/16-inch pilot shank for accurate hole alignment
• Straight 1/2-inch shank for compatibility with standard toolholders and drill chucks
• Bright uncoated finish suitable for use with cutting fluids
• Right-hand cutting direction for standard spindle rotation

Compatibility

Designed for use with 3/16-inch interchangeable pilots in standard counterbore toolholding systems. Confirm pilot and holder compatibility before installation.

Installation Notes

A licensed machinist or qualified toolroom technician should install and operate this counterbore. Ensure the machine spindle is fully stopped and locked out before changing pilots or seating the shank in the toolholder. Use appropriate cutting fluid for the workpiece material to extend tool life and improve surface finish. Secure the straight shank firmly in a drill chuck or end mill holder to the depth recommended by the toolholder manufacturer before beginning the cut.