Value Collection GH8790552 Counterbore 55/64in 3 Flute Hss

Product Description

The VALUE COLLECTION GH8790552 is a three-flute interchangeable pilot counterbore designed for precision enlarging and seating of bolt holes in metal workpieces. Built from high speed steel with a bright, uncoated finish, this tool delivers consistent cutting performance in general machining and fabrication environments. The straight shank measures 3/4 inches in diameter and 3-7/8 inches in length, providing a secure grip in standard drill press or milling machine chucks. With an overall length of 5-3/8 inches and a counterbore diameter of 55/64 inches, it is suited for creating flat-bottomed recesses that accept socket head cap screws and similar fastener heads.

This counterbore is appropriate for use in machine shops, fabrication facilities, and maintenance environments where consistent, clean counterbore profiles are required. The interchangeable pilot design accepts a 1/4-inch pilot shank, allowing the cutting head to be paired with different pilot sizes for varied fastener applications. Right-hand cutting direction is standard for conventional spindle rotation. It is typically installed by machinists and tool-and-die or maintenance technicians working on steel, aluminum, and similar metals.

Key Features

• 55/64-inch counterbore diameter for seating standard fastener heads flush or below the surface
• Three-flute geometry for balanced cutting and improved chip evacuation
• High speed steel construction provides durability across common ferrous and non-ferrous metals
• Bright, uncoated finish suited for use with cutting fluids
• 3/4-inch straight shank fits standard chucks and collet holders
• Interchangeable pilot accepts a 1/4-inch pilot shank for flexible setup

Compatibility

Designed as an OEM-style interchangeable pilot counterbore compatible with 1/4-inch pilot shanks; verify chuck capacity and spindle speed ratings before use.

Installation Notes

A licensed machinist or qualified maintenance technician should install and operate this tool. Secure the straight shank firmly in the chuck before initiating spindle rotation, and confirm the pilot shank is fully seated and locked. Power down and lock out the machine before changing pilots or adjusting workpiece setups. Use appropriate cutting fluid for the material being machined to extend tool life and improve finish quality.