Value Collection GH8815326 Pilot Counterbore 3 Flute Cobalt

Product Description

The VALUE COLLECTION GH8815326 is a cobalt steel interchangeable pilot counterbore designed for precision counterboring operations in metal fabrication and machining applications. The tool features a 0.5-inch counterbore diameter with a 7/16-inch straight shank and three flutes for efficient chip evacuation and smooth cutting. At 4-5/16 inches overall length with a 3-1/16-inch shank length, this right-hand cutting tool delivers the rigidity needed for accurate seat depth in production and repair environments. The bright, uncoated finish is standard for cobalt tooling used across a range of ferrous and non-ferrous materials.

This counterbore is suited for machine shops, aerospace maintenance facilities, and general metalworking operations requiring a reliable interchangeable pilot system. The 3/16-inch pilot shank diameter compatibility allows the use of standard interchangeable pilots, making this tool adaptable across multiple counterbore diameters in the same holder system. It is appropriate for use in drill presses, CNC machining centers, and manual milling machines where consistent counterbore geometry is required.

Key Features

• 0.5-inch counterbore diameter for standard fastener seat applications
• Cobalt steel construction for increased heat and wear resistance over standard HSS
• Three-flute geometry promotes chip clearance and reduces chatter
• 7/16-inch straight shank for broad machine compatibility
• Interchangeable pilot design accepts 3/16-inch pilot shank diameter pilots
• Bright, uncoated finish — no additional coating to affect dimensional tolerance
• Right-hand cutting direction, standard for conventional machining setups

Compatibility

Designed for use with interchangeable pilot counterbore systems accepting a 3/16-inch pilot shank diameter. Compatible with standard straight-shank tool holders in drill presses, milling machines, and CNC machining centers.

Installation Notes

Installation is performed by machinists or toolroom technicians familiar with rotating cutting tools. Secure the straight shank in a compatible tool holder and verify runout before cutting. Ensure the workpiece is firmly clamped and the machine spindle is stopped completely before changing pilots or adjusting tool depth. Follow applicable shop safety procedures and machine manufacturer guidelines when setting feed rates and spindle speeds for cobalt tooling.