Value Collection GH8840480 Counterbore 3/4 Inch 4 Flute

Product Description

The VALUE COLLECTION GH8840480 is a 4-flute interchangeable pilot counterbore designed for precise counterboring operations in metal fabrication and machining applications. Built from high speed steel with a bright, uncoated polished finish, it cuts in a right-hand direction and accepts a separately sourced pilot via a 3/16 inch pilot shank compatibility. The 1/4 inch straight shank allows it to seat securely in standard drill chucks and milling machine collets. At 3-1/8 inches overall length, this aircraft-style counterbore provides the reach needed for typical aerospace and general-purpose metal work. Machinists and tool-and-die professionals working on structural and assembly holes will find this a practical, workhorse cutter.

This counterbore is suited for use in manual mills, drill presses, and CNC machining centers where a 3/4 inch counterbore diameter is required. Aircraft-style geometry makes it appropriate for work on aluminum, mild steel, and similar machinable metals commonly encountered in aerospace fabrication, general machine shops, and maintenance repair operations. The interchangeable pilot design allows the pilot to be swapped for different fastener clearance requirements without replacing the body, reducing tooling cost on multi-fastener jobs.

Key Features

• 3/4 inch counterbore diameter for standard fastener head recessing
• 4-flute aircraft-style geometry for smooth, stable cutting action
• High speed steel construction for durability across common machinable metals
• Interchangeable pilot accepts 3/16 inch pilot shank for flexible fastener compatibility
• 1/4 inch straight shank fits standard drill chucks and collet holders
• Bright, uncoated polished finish with right-hand cutting direction

Compatibility

Designed as a standard interchangeable pilot counterbore compatible with drill presses, milling machines, and CNC machining centers accepting a 1/4 inch straight shank. Pilot shank compatibility is 3/16 inch.

Installation Notes

Installation and operation should be performed by qualified machinists familiar with rotating cutting tool safety. Secure the straight shank firmly in a properly sized collet or drill chuck before operation, and verify the interchangeable pilot is fully seated and locked before beginning a cut. Always shut down the spindle and confirm the machine is at a full stop before changing pilots or inspecting the cutting edge. Follow applicable shop safety standards and machine manufacturer guidelines for speeds and feeds appropriate to the workpiece material.