Value Collection GH8790164 Counterbore 1/4 in 3 Flute Hss

Product Description

The VALUE COLLECTION GH8790164 is an interchangeable pilot counterbore designed for creating flat-bottomed recesses that seat fastener heads flush or below a workpiece surface. Built from high-speed steel with a bright, uncoated finish, this tool features three flutes and a right-hand cutting direction for clean, controlled material removal. The straight shank measures 15/64 inches in diameter and 3-1/16 inches in length, with an overall tool length of 3-13/16 inches. It accepts a 3/32-inch pilot shank for precise hole alignment during counterboring operations. Machinists, tool-and-die workers, and maintenance technicians install this type of cutter in drill presses, milling machines, and CNC machining centers.

This counterbore is suited for light-to-medium duty machining applications in metal fabrication shops, maintenance facilities, and production environments. The interchangeable pilot design allows the operator to swap pilots to match different clearance hole sizes without replacing the body, making it a practical choice for shops that work across varied fastener specifications. The 1/4-inch counterbore diameter is commonly used with small-diameter socket head cap screws and similar fasteners in precision assemblies.

Key Features

• 1/4-inch counterbore diameter for recessing small-diameter fastener heads
• Interchangeable pilot accepts 3/32-inch pilot shank for accurate hole registration
• Three flutes provide a balance of chip clearance and cutting edge support
• High-speed steel construction offers good hardness and wear resistance for ferrous and non-ferrous materials
• Bright uncoated finish — suitable for use with cutting fluids to extend tool life
• Right-hand cutting direction, compatible with standard drill press and milling spindle rotation

Compatibility

Designed as an OEM-style interchangeable pilot counterbore for use in standard straight-shank tool holders on drill presses, knee mills, and CNC machining centers that accept a 15/64-inch straight shank.

Installation Notes

Installation and operation should be performed by a qualified machinist or toolroom technician. Secure the straight shank firmly in an appropriate collet or drill chuck before use, and verify the pilot is fully seated and locked prior to cutting. Always reduce spindle speed and apply cutting fluid when machining harder ferrous materials to prevent premature tool wear. Inspect the pilot and cutting edges for wear or damage before each use.