Value Collection GH8816480 Counterbore 1-3/4in 5 Flute Cobalt

Product Description

The VALUE COLLECTION GH8816480 is a 5-flute interchangeable pilot counterbore designed for precision counter-boring operations in metal fabrication and machining applications. Built from cobalt steel with a bright, uncoated finish, this tool delivers the heat resistance and edge retention required when working with tough alloys and hardened 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 cutting geometry is right-hand and accepts a 7/16 inch pilot shank for accurate hole location and repeatable bore depth.

This counterbore is suited for machine shop, aerospace, and industrial maintenance environments where accurate seat preparation for socket head cap screws and fastener heads is required. The interchangeable pilot design allows one body to be used with multiple pilot diameters, reducing tooling inventory. It is typically installed in knee mills, vertical machining centers, and drill presses by machinists and tool-and-die professionals working to tight tolerance specifications.

Key Features

• 1-3/4 inch counterbore diameter for large fastener seat preparation
• 5 flutes for smooth chip evacuation and improved surface finish
• Cobalt steel construction for heat resistance in hard and abrasive materials
• Bright, uncoated finish suitable for use with cutting fluids
• Interchangeable pilot accepts 7/16 inch pilot shank diameter
• Right-hand cutting direction for standard spindle rotation

Compatibility

Designed as an OEM-style interchangeable pilot counterbore compatible with straight shank tool holders accepting a 1-1/4 inch shank diameter; pilot compatibility is 7/16 inch pilot shank diameter.

Installation Notes

Installation and use should be performed by a qualified machinist familiar with rotating cutting tools and machine tool operation. Secure the straight shank in a properly sized collet or drill chuck, ensuring full shank engagement before operation. Insert the appropriate pilot into the counterbore body and verify it is locked before starting the spindle. Always bring the spindle to a complete stop before changing pilots or inspecting the cutting edges, and use appropriate cutting fluid for the workpiece material.