Value Collection GH8790362 Counterbore 9/16 in 3 Flute Hss

Product Description

The VALUE COLLECTION GH8790362 is a 3-flute interchangeable pilot counterbore designed for precision counterboring operations in metal fabrication and machining applications. Built from high speed steel with a bright, uncoated finish, this tool features a 9/16 inch counterbore diameter and a 1/2 inch straight shank. With an overall length of 4-5/16 inches and a right-hand cutting direction, it is suited for use in drill presses, milling machines, and hand-held power equipment where a clean, flat-bottomed seat is required around a drilled hole. The interchangeable pilot design allows the pilot to be swapped to match the fastener or hole size being worked.

This counterbore is intended for use in general metalworking, maintenance, and repair environments where socket head cap screws or similar fasteners must be recessed flush or below a workpiece surface. It is compatible with a 3/16 inch pilot shank diameter, making it appropriate for standard fastener seating applications in ferrous and non-ferrous metals. Machinists, tool-and-die technicians, and maintenance mechanics working in industrial or job-shop settings are the typical end users for this type of tooling.

Key Features

• 9/16 inch counterbore diameter for precise flat-bottomed seat creation
• 3-flute geometry for smooth cutting action and chip evacuation
• High speed steel construction provides durability across a range of metal workpieces
• 1/2 inch straight shank for broad compatibility with standard chucks and holders
• Interchangeable pilot accepts 3/16 inch pilot shank for versatile fastener sizing
• Bright, uncoated finish suitable for general-purpose machining without added coating wear considerations

Compatibility

Designed as a general-purpose interchangeable pilot counterbore compatible with standard 1/2 inch straight-shank tool holders and accepts a 3/16 inch interchangeable pilot shank.

Installation Notes

This tool is typically installed by machinists or maintenance technicians using a standard drill press, mill, or hand-held power drill with a compatible 1/2 inch chuck. Secure the straight shank firmly in the chuck before operation and confirm the interchangeable pilot is properly seated before beginning the cut. Always power down and de-energize the machine before changing pilots or removing the tool. Follow applicable shop safety standards and manufacturer guidelines for feed rate and spindle speed appropriate to the workpiece material.