Value Collection GH8815508 Pilot Counterbore 25/32 in

Product Description

The VALUE COLLECTION GH8815508 is a cobalt steel interchangeable pilot counterbore designed for precision counterboring operations in metal fabrication and machining applications. The tool features a 25/32-inch counterbore diameter, a 5/8-inch straight shank, and three flutes for efficient material removal and clean seat geometry. Built from cobalt steel with a bright, uncoated finish, this counterbore offers improved heat and wear resistance compared to standard high-speed steel tooling. It is sized for use with a 1/4-inch pilot shank and is suited for right-hand cutting in production and repair environments.

This counterbore is used in metalworking shops, aerospace maintenance facilities, and general machining operations where accurate bolt-seat preparation is required. The interchangeable pilot design allows the operator to swap pilots for different clearance hole sizes without replacing the entire tool body. It is appropriate for use in drill presses, milling machines, and CNC machining centers. The 5-3/8-inch overall length and 3-7/8-inch shank length provide adequate reach for standard-depth counterbore applications. Machinists and tool and die technicians are the primary installers of this tool.

Key Features

• 25/32-inch counterbore diameter for precise bolt-seat sizing
• Cobalt steel construction for improved heat resistance and tool life
• Three-flute geometry for smooth cutting and efficient chip evacuation
• 5/8-inch straight shank compatible with standard tool holders and chucks
• Interchangeable 1/4-inch pilot shank for flexible application use
• Bright, uncoated finish suitable for use with cutting fluids

Compatibility

Designed for use with interchangeable pilot counterbore systems accepting a 1/4-inch pilot shank diameter and a 5/8-inch straight shank tool holder or drill chuck.

Installation Notes

This counterbore should be installed by a qualified machinist in a securely mounted spindle with proper tool holder clamping. Ensure the workpiece is firmly fixtured and the machine is at a safe, controlled speed before engaging the cut. Use an appropriate cutting fluid to extend tool life and improve surface finish. Inspect the pilot and counterbore body for wear or runout before each use.