Value Collection GH8815151 Pilot Counterbore 15/64 in

Product Description

The VALUE COLLECTION GH8815151 is a 3-flute interchangeable pilot counterbore designed for precision counterboring operations in metal fabrication and machining applications. Built from cobalt steel with a bright, uncoated finish, this tool delivers solid performance in harder ferrous and stainless materials where high-speed steel tools fall short. The straight shank measures 15/64 inches in diameter and 3-1/16 inches in length, with a 3-13/16 inch overall length that fits standard drill press and milling machine setups. Right-hand cutting geometry keeps chip evacuation clean across the three flutes. Machinists and tool-and-die professionals are the primary users of this style of counterbore.

This interchangeable pilot counterbore is suited to production and job-shop environments where counterbore diameter and pilot combinations are swapped frequently. The 15/64 inch counterbore diameter pairs with a 3/32 inch pilot shank diameter, making it appropriate for light-duty counterboring in steel, stainless, cast iron, and similar materials. It is not designated as an aircraft-style counterbore. Typical applications include creating recessed seats for socket head cap screws and similar fasteners in precision mechanical assemblies.

Key Features

• 15/64 inch counterbore diameter with 3/32 inch pilot shank compatibility
• Cobalt steel construction for improved heat and wear resistance over standard HSS
• 3-flute right-hand cutting geometry for efficient chip removal
• Straight shank at 15/64 inches for secure chuck retention
• Bright, uncoated finish — no coating buildup at cutting edges
• Interchangeable pilot design allows flexible pilot swaps without replacing the body

Compatibility

Designed for use with interchangeable pilot counterbore systems accepting a 3/32 inch pilot shank diameter and a 15/64 inch straight shank body in standard drill press, milling machine, or lathe chuck setups.

Installation Notes

Installation and use of this counterbore should be performed by qualified machinists familiar with cutting tool setup and workholding practices. Secure the straight shank fully in a properly rated drill chuck or collet before operation, and verify pilot fit before beginning the cut. Always follow the machine manufacturer speed-and-feed recommendations for cobalt tooling in the workpiece material. Power down and de-energize the machine spindle completely before changing pilots or removing the tool.