Value Collection GH8830507 Counterbore 25/32in 4 Flute Hss

Product Description

The VALUE COLLECTION GH8830507 is an interchangeable pilot counterbore designed for precision counter-boring operations in metal fabrication and aerospace-style applications. Built from high speed steel, this tool delivers durable cutting performance across a range of ferrous and non-ferrous materials. The 25/32-inch counterbore diameter pairs with a 1/2-inch straight shank for secure chuck engagement. With 4 flutes and a bright, uncoated finish, the tool provides clean material removal and is suited for right-hand cutting in production and maintenance environments. Licensed machinists, tool-and-die workers, and aircraft maintenance technicians are the primary installers of this tool type.

This counterbore is designed for aircraft-style applications where precise seat geometry is required around fastener holes. It accepts an interchangeable pilot with a 3/16-inch pilot shank diameter, allowing the tool to be adapted to different pilot sizes without replacing the body. At 5-3/8 inches overall length, it is compatible with standard drill press setups and CNC machining centers where extended reach is needed. Typical use cases include countersinking bolt seats in structural panels, frames, and assemblies.

Key Features

• 25/32-inch counterbore diameter for accurate fastener seat sizing
• 1/2-inch straight shank for standard chuck compatibility
• Interchangeable pilot design accepts 3/16-inch pilot shank diameter
• 4-flute geometry for smooth, efficient material removal
• High speed steel construction for durability in metalworking applications
• Bright, uncoated finish suitable for general-purpose cutting
• Aircraft style designation for use in aerospace-type fastener applications

Compatibility

Designed for use in aircraft-style counterboring applications requiring a 25/32-inch counterbore diameter and a 3/16-inch interchangeable pilot shank. Fits standard 1/2-inch chucks on drill presses and machining centers.

Installation Notes

This tool is installed and operated by machinists, maintenance technicians, or qualified metalworking professionals. Secure the 1/2-inch straight shank firmly in the chuck before operation and verify pilot seating before engaging the workpiece. Always power down the machine and bring it to a complete stop before changing pilots or adjusting tool position. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain cut quality.