Value Collection GH8815540 Counterbore 27/32 in Hss

Product Description

The VALUE COLLECTION GH8815540 is a 3-flute interchangeable pilot counterbore designed for enlarging and finishing the entry of drilled holes to accept socket head cap screws, bolts, or similar fasteners. Machined from high speed steel with a bright, uncoated finish, this tool delivers reliable cutting performance across a range of steel, aluminum, and general-purpose workpiece materials. The straight shank measures 3/4 inches in diameter and 3-7/8 inches in length. Overall tool length is 5-3/8 inches. The cutting diameter is 27/32 inches. A pilot shank diameter compatibility of 1/4 inch governs interchangeable pilot selection. Right-hand cutting direction is standard. Machinists, tool-and-die makers, and maintenance technicians are the primary users.

This counterbore is suited to general machining, maintenance, and fabrication environments where precise flat-bottomed recesses are required. Typical applications include preparing bolt hole seats in structural components, machine bases, fixtures, and tooling plates. The interchangeable pilot design allows the same body to accept different pilot sizes, reducing tooling inventory where multiple pilot diameters are needed. The bright finish is appropriate for dry or lightly lubricated cutting operations across non-hardened materials.

Key Features

• 27/32 inch counterbore cutting diameter for accurate socket head recess sizing
• 3-flute geometry provides good chip evacuation and a smooth flat-bottom finish
• High speed steel construction offers toughness and re-grindability
• Interchangeable pilot system accepts 1/4 inch pilot shank diameter
• 3/4 inch straight shank for use in standard drill press or milling machine toolholders
• Bright, uncoated finish suitable for dry cutting and light cutting fluid applications

Compatibility

Designed as an OEM-style replacement or standard interchangeable pilot counterbore for use in drill presses, milling machines, and similar machine tool setups requiring a 3/4 inch straight shank holder and a 1/4 inch interchangeable pilot.

Installation Notes

Installation and operation should be performed by qualified machinists or maintenance technicians familiar with rotating cutting tools. Secure the straight shank firmly in a properly sized collet, chuck, or toolholder before operation, and verify that the interchangeable pilot is seated and locked per the tool system requirements. Power down the machine and lock out energy sources before inserting or removing the pilot or changing tooling. Always use appropriate cutting fluid or follow the workpiece material manufacturer recommendations for dry cutting to maximize tool life.