Value Collection GH8816209 Counterbore 1-5/16 in 5 Flute Cobalt

Product Description

The Value Collection GH8816209 is a 5-flute interchangeable pilot counterbore designed for precision hole finishing in metalworking applications. Built from cobalt steel with a bright, uncoated finish, this tool delivers consistent cutting performance in tough materials including alloy steels and stainless. The straight shank measures 1 inch in diameter and 4-5/8 inches in length, with an overall length of 6-5/8 inches. The interchangeable pilot accepts a 3/8-inch pilot shank, allowing the technician to swap pilots for different fastener sizes without replacing the body. Right-hand cutting geometry ensures compatibility with standard drill press and mill spindle rotation.

This counterbore is suited for machine shops, maintenance facilities, and fabrication environments where socket head cap screws or similar fasteners must sit flush or below a workpiece surface. It is appropriate for use in ferrous metals, high-strength alloys, and other demanding materials where cobalt tooling is preferred over standard HSS. The interchangeable pilot design makes it practical for shops that work with multiple fastener diameters on a recurring basis.

Key Features

• 1-5/16 inch counterbore diameter for standard socket head fastener fitment
• Cobalt steel construction for improved heat and wear resistance compared to standard HSS
• 5-flute design promotes smoother cuts and reduced chatter on the counterbore seat
• Interchangeable pilot system accepts a 3/8-inch pilot shank diameter
• Straight 1-inch shank fits standard drill press chucks and milling machine collets
• Bright uncoated finish allows easy visual inspection of cutting edge condition

Compatibility

Designed for use with interchangeable pilot systems accepting a 3/8-inch pilot shank. Fits standard straight-shank tool holders with a 1-inch shank bore.

Installation Notes

Installation and use should be performed by a qualified machinist or toolroom technician familiar with rotating cutting tools. Secure the shank fully in the chuck or collet before operation and verify pilot engagement in the guide hole before beginning the cut. Always power down the machine and bring the spindle to a complete stop before changing pilots or inspecting cutting edges. Follow applicable shop safety standards and machine manufacturer guidelines for maximum spindle speed and feed rate.