Value Collection GH8815425 Pilot Counterbore 21/32 in

Product Description

The VALUE COLLECTION GH8815425 is a 3-flute interchangeable pilot counterbore designed for precision counterboring operations in metalworking and fabrication applications. Built from cobalt steel with a bright, uncoated finish, this tool delivers reliable cutting performance in ferrous and non-ferrous materials. The straight shank measures 1/2 inch in diameter and 3-7/8 inches in length, giving it a secure hold in standard drill press chucks and milling machine spindles. Overall length is 5-1/8 inches. With a 21/32 inch counterbore diameter and compatibility with 3/16 inch pilot shanks, it suits controlled, repeatable seat cutting where fastener clearance and flush-mount requirements must be met.

This counterbore is suited for machine shops, maintenance facilities, and manufacturing environments where accurate counterboring of bolt and screw seats is required. The right-hand cutting direction and interchangeable pilot design make it adaptable to multiple hole sizes with a single tool body. It is commonly used in structural, aerospace-adjacent, and general metalworking setups. Licensed machinists and tooling technicians are the primary installers and operators.

Key Features

• 21/32 inch counterbore diameter for precise fastener seat cutting
• Cobalt steel construction for improved heat and wear resistance versus standard high-speed steel
• 3-flute geometry for smooth, chatter-resistant cutting action
• Interchangeable pilot accepts 3/16 inch pilot shank diameter
• Bright, uncoated finish suitable for use with cutting fluids
• Right-hand cutting direction; compatible with standard drill presses and milling spindles

Compatibility

Designed for use with 3/16 inch interchangeable pilot shanks. Fits standard 1/2 inch straight-shank toolholders, drill press chucks, and milling machine collets or chucks rated for that shank diameter.

Installation Notes

Install in a drill press, milling machine, or CNC machining center with a properly rated chuck or collet for a 1/2 inch straight shank. Secure the workpiece firmly before operation to prevent movement during the cutting cycle. Apply an appropriate cutting fluid for the material being bored to extend tool life and improve surface finish. Inspect the pilot and counterbore body for wear or damage before each use.