Value Collection GH8815243 Counterbore 3/8in 3 Flute Cobalt

Product Description

The VALUE COLLECTION GH8815243 is a 3-flute interchangeable pilot counterbore designed for precise counter-boring operations in metal fabrication and machining applications. Built from cobalt steel with a bright, uncoated finish, this tool offers solid heat and wear resistance compared to standard high-speed steel. The 3/8-inch counterbore diameter and 5/16-inch straight shank make it compatible with standard drill press and milling machine setups. Right-hand cutting direction and a 4-1/16-inch overall length give the tool enough reach for typical workpiece thicknesses encountered in production and maintenance machining environments. The interchangeable pilot design allows the cutting body to be used with different pilot sizes for greater flexibility across jobs.

This counterbore is suited for machine shops, maintenance facilities, aerospace shops, and general metalworking operations requiring accurate bolt-seat recesses. It is appropriate for use in steel, stainless, and other ferrous materials where cobalt tooling is the standard choice for improved cutting performance and longer tool life. A licensed machinist or tool-and-die technician would typically deploy this in a drill press, milling machine, or CNC machining center. The 5/32-inch pilot shank diameter compatibility suits common fastener sizes encountered in structural and mechanical assemblies.

Key Features

• 3/8-inch counterbore diameter for standard bolt-seat recesses
• Cobalt steel construction for heat resistance and extended tool life in ferrous materials
• 3-flute geometry for smooth chip evacuation and consistent finish
• Straight shank at 5/16 inches for secure clamping in standard chucks and collets
• Interchangeable pilot design accommodates 5/32-inch pilot shank diameter
• Bright, uncoated finish — no coating buildup to affect dimensional accuracy

Compatibility

Designed as an OEM-style replacement and standard-fit interchangeable pilot counterbore for drill press, milling machine, and CNC machining center spindles accepting a 5/16-inch straight shank; pilot shank diameter compatibility is 5/32 inches.

Installation Notes

Installation and use should be performed by a qualified machinist. Secure the straight shank firmly in a properly sized chuck or collet before operating. Ensure the machine spindle is fully stopped and locked before changing pilots or removing the tool. Apply appropriate cutting fluid for the workpiece material to maximize tool life and surface finish quality.