Value Collection GH8790487 Counterbore 3/4 in Hss 3 Flute

Product Description

The VALUE COLLECTION GH8790487 is an interchangeable pilot counterbore designed for precision recess machining in metal fabrication and maintenance applications. Built from high speed steel with a bright, uncoated polished finish, this counterbore features a 3/4 inch cutting diameter, a 1/2 inch straight shank, and three flutes for efficient chip evacuation. The overall length is 5-3/8 inches, with a shank length of 3-7/8 inches, making it compatible with standard drill press and milling machine setups. Right-hand cutting geometry suits conventional drilling operations. Machinists, tool and die technicians, and maintenance mechanics are the primary installers of this type of tooling.

This counterbore is suited for creating flat-bottomed recesses in ferrous and non-ferrous materials to seat socket head cap screws, bolts, and similar fasteners flush or below a workpiece surface. It is commonly used in job shops, manufacturing facilities, and MRO environments where consistent, repeatable counterbore depth and diameter are required. The interchangeable pilot design accepts a 1/4 inch pilot shank, allowing the pilot to be swapped to match different bolt or screw clearance holes without replacing the body.

Key Features

• 3/4 inch counterbore diameter for standard fastener recess applications
• High speed steel construction for durability across ferrous and non-ferrous workpieces
• 3-flute design promotes efficient chip removal and smooth surface finish
• Bright, uncoated polished finish suitable for general-purpose machining
• Interchangeable pilot accepts a 1/4 inch pilot shank
• Right-hand cutting direction for use with standard drill press and milling machine rotation

Compatibility

Designed as an OEM-style replacement and general-purpose interchangeable pilot counterbore for use with straight-shank tool holders and drill press chucks accepting a 1/2 inch shank diameter.

Installation Notes

This tooling is installed and used by machinists and maintenance mechanics operating drill presses, milling machines, or similar machine tools. Secure the workpiece firmly before operation and ensure the pilot shank is fully seated and locked before cutting. Select a spindle speed appropriate for the workpiece material and cutting diameter per standard machining reference charts. Inspect the pilot and cutting edges for wear before each use and replace if chipping or dulling is observed.