Value Collection GH8816043 Counterbore 1-1/16 in Cobalt

Product Description

The VALUE COLLECTION GH8816043 is a 3-flute interchangeable pilot counterbore designed for precision enlarging and finishing of bolt-seat recesses in metal fabrication and machining applications. Built from cobalt steel with a bright, uncoated finish, this tool delivers solid performance in harder workpiece materials where high-speed steel would wear prematurely. The counterbore measures 1-1/16 inches in diameter with a 3/4-inch straight shank and an overall length of 6-3/8 inches. The 4-5/8-inch shank length provides extended reach for deeper setups. Cutting action is right-hand direction. Machinists and tool-and-die professionals typically specify this style for consistent, repeatable counterbore geometry on production or repair runs.

This interchangeable pilot counterbore is suited for use in vertical mills, drill presses, and CNC machining centers where a clean, flat-bottomed counterbore seat is required. The interchangeable pilot design accepts a 5/16-inch pilot shank, allowing the tool to be reused with different pilot sizes for varying fastener clearance requirements. It is most commonly applied in aerospace-adjacent metalworking, general machining, and maintenance repair operations on ferrous and harder non-ferrous materials.

Key Features

• 1-1/16 inch counterbore diameter for standard bolt-seat recessing
• Cobalt steel construction for improved wear resistance in harder materials
• 3-flute geometry for chip clearance and surface finish quality
• Straight shank at 3/4 inch diameter fits standard machine tool holders
• Interchangeable pilot accepts 5/16 inch pilot shank diameter
• Bright, uncoated finish suitable for use with cutting fluids

Compatibility

Designed as an OEM-style interchangeable pilot counterbore compatible with standard straight-shank tool holders accepting a 3/4 inch shank, and pilot systems using a 5/16 inch pilot shank.

Installation Notes

Installation and use should be performed by a qualified machinist or tooling technician. Secure the straight shank firmly in a collet or tool holder rated for the shank diameter before operation, and verify the pilot is properly seated before cutting. Always apply appropriate cutting fluid when machining ferrous or hardened materials to extend tool life and maintain finish quality. Follow all applicable shop safety protocols and machine guarding requirements during setup and operation.