Value Collection GH8816407 Counterbore 1-5/8in 5 Flute Cobalt

Product Description

The VALUE COLLECTION GH8816407 is a 5-flute interchangeable pilot counterbore designed for precision counterboring operations in metalworking and machining applications. Built from cobalt steel with a bright, uncoated finish, this tool delivers the hardness and heat resistance needed for cutting harder ferrous materials. The straight shank measures 1-1/4 inches in diameter and 5-7/8 inches in length, with an overall length of 8-1/8 inches. The 1-5/8-inch counterbore diameter accommodates a 7/16-inch pilot shank. Right-hand cutting geometry ensures compatibility with standard spindle rotation on most machine tools. Typically installed by machinists and tool-and-die professionals in shop environments.

This counterbore is suited for creating flat-bottomed recesses for socket head cap screws and similar fasteners in structural, aerospace-adjacent, and general metalworking applications. The interchangeable pilot design allows the pilot to be swapped out, extending tool versatility across varying hole diameters without replacing the body. The cobalt construction makes it appropriate for use on alloy steels, stainless steel, cast iron, and other materials that generate high cutting temperatures.

Key Features

• 1-5/8 inches counterbore diameter for flat-bottomed recess cutting
• 5-flute design for improved chip evacuation and surface finish
• Cobalt steel construction for heat resistance when cutting hard alloys
• Straight shank at 1-1/4 inches diameter for secure chuck or holder engagement
• Interchangeable pilot accepts 7/16-inch pilot shank for flexible setup
• Bright, uncoated finish suitable for use with cutting fluids

Compatibility

Designed for use in vertical mills, drill presses, and CNC machining centers equipped with toolholders or chucks accepting a 1-1/4-inch straight shank. Compatible with 7/16-inch interchangeable pilots.

Installation Notes

A licensed machinist or experienced shop technician should install and operate this tool. Ensure the machine spindle is fully stopped and locked out before mounting or changing pilots. Secure the straight shank firmly in an appropriate collet, end mill holder, or drill chuck rated for the shank diameter. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain dimensional accuracy.