Value Collection GH8862005 Counterbore Set Hss 4 Piece

Product Description

The VALUE COLLECTION GH8862005 is a solid pilot counterbore set designed for use with 10 to 6 wire socket head cap screws. Manufactured from high speed steel, this set delivers the hardness and wear resistance needed for counterboring operations in steel, cast iron, aluminum, and similar materials. The straight shank design provides secure chuck retention, and the 3-flute geometry promotes chip evacuation and accurate seat geometry. The set includes 4 pieces, covering the range of sizes needed for socket head cap screw clearance and seating applications in machining and fabrication work. Machinists, tool and die technicians, and maintenance professionals are the primary users of this tooling.

This counterbore set is suited for bench drill press, mill, or hand-held drilling applications where a flat-bottomed recess is required to seat socket head cap screws flush or below the workpiece surface. It is commonly used in general metalworking, fixture building, machine repair, and production machining environments. The solid pilot design ensures the counterbore stays centered on the existing pilot hole, reducing chatter and improving concentricity of the finished seat.

Key Features

• High speed steel construction for hardness and extended tool life in metalworking applications
• Solid pilot design maintains concentricity with the existing drilled hole
• 3-flute configuration promotes efficient chip evacuation and clean flat-bottom seating
• Straight shank for compatibility with standard drill chucks and milling machine collets
• 4-piece set covers 10 to 6 wire socket head cap screw sizing range

Compatibility

Designed for use with 10 to 6 wire socket head cap screws. Intended for straight shank chuck setups on drill presses, knee mills, and similar machine tool spindles.

Installation Notes

This tooling is installed and used by machinists and maintenance technicians on drill presses or milling machines. Secure the straight shank firmly in the chuck or collet before operation and confirm the pilot fits the existing hole without slop before beginning the counterbore cut. Use appropriate cutting fluid for the workpiece material to extend tool life and improve finish quality. Power down and de-energize the machine spindle before changing or inspecting tooling.