Value Collection GH8830424 Counterbore 21/32 in 4 Flute Hss

Product Description

The VALUE COLLECTION GH8830424 is an interchangeable pilot counterbore designed for precision counterboring operations in metal fabrication and aerospace-style applications. Built from high speed steel with a bright, uncoated polished finish, this tool features a 21/32-inch counterbore diameter and a 1/2-inch straight shank for secure chuck engagement. Four right-hand cutting flutes deliver clean, consistent material removal. The 5-3/8-inch overall length provides reach and clearance in a range of drilling setups. It is used by machinists, tool-and-die workers, and aircraft maintenance technicians requiring reliable counterbore geometry.

This counterbore is suited for aircraft-style applications where interchangeable pilots allow a single body to accommodate multiple pilot shank diameters. The included pilot shank compatibility is 3/16 inch. Typical use cases include spot-facing bolt seats, countersinking fastener recesses, and preparing hole geometry for flush or recessed hardware in aluminum, mild steel, and similar materials. The straight shank mounts directly in standard drill press chucks, milling machine spindles, or CNC tool holders without adapters.

Key Features

• 21/32-inch counterbore diameter for precise recess sizing
• 1/2-inch straight shank fits standard chucks and collets
• 4 right-hand cutting flutes for smooth, efficient stock removal
• High speed steel construction for durability across ferrous and non-ferrous metals
• Bright, uncoated polished finish suitable for general-purpose machining
• Aircraft-style interchangeable pilot design accepts 3/16-inch pilot shank
• 5-3/8-inch overall length provides adequate reach for most setups

Compatibility

Designed as an interchangeable pilot counterbore compatible with 3/16-inch pilot shanks. Suitable for use in drill presses, milling machines, and CNC spindles accepting a 1/2-inch straight shank toolholder.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance technicians familiar with rotating cutting tools. Ensure the machine spindle is fully powered down and the chuck or collet is locked before installing or removing the counterbore. Verify pilot shank engagement and shank seating before beginning the cut. Always operate within the recommended speed range for high speed steel tooling and the workpiece material.