Value Collection GH8860249 Solid Pilot Counterbore Hss

Product Description

The VALUE COLLECTION GH8860249 is a solid pilot counterbore designed to create clean, flat-bottomed recesses for fillister-head screws in metalworking and machining applications. The tool features a 19/32 inch counterbore diameter paired with a 3/8 inch standard pilot diameter that registers in a pre-drilled hole to keep the counterbore concentric. Two forward-cutting flutes clear chips efficiently during the cut. The straight-cylindrical shank measures 3/8 inch in diameter, and the overall length is 4-3/8 inches. The body is machined from high speed steel, giving it the heat resistance and hardness needed for repetitive use in steel, aluminum, and similar workpiece materials.

This counterbore is suited for machine shops, tool rooms, and production environments where fillister-head fasteners must sit flush or recessed in a workpiece. It is compatible with standard milling machines, drill presses, and CNC machining centers that accept a 3/8 inch straight-cylindrical shank. The 2-flute geometry keeps cutting forces manageable in a wide range of materials. Machinists, tool-and-die makers, and maintenance technicians working in industrial and aerospace-adjacent environments will find this tool appropriate for precision recess work where concentricity and flat-bottom finish matter.

Key Features

• 19/32 inch counterbore diameter sized for fillister-head screw recesses
• 3/8 inch standard pilot registers in the pilot hole for concentric cutting
• High speed steel construction provides hardness and heat resistance for steel and non-ferrous materials
• 2-flute forward-cutting geometry for controlled chip evacuation
• 3/8 inch straight-cylindrical shank fits standard drill chucks and collets
• 4-3/8 inch overall length provides reach for typical machining setups

Compatibility

Designed for use with fillister-head screws, compatible with machine tools accepting a 3/8 inch straight-cylindrical shank, including drill presses and milling machines.

Installation Notes

Installation and use is performed by machinists or qualified shop technicians. Secure the shank firmly in a drill chuck or collet before operation and verify the pilot diameter matches the pre-drilled pilot hole to maintain concentricity. Power down and de-energize the machine spindle completely before changing or inspecting the tool. Use appropriate cutting fluid for the workpiece material to extend tool life and improve surface finish.