Value Collection GH8860041 Solid Pilot Counterbore Hss

Product Description

The VALUE COLLECTION GH8860041 is a solid pilot counterbore designed for machining recessed seats for fillister-head screws. Built from high speed steel, it delivers consistent cutting performance in ferrous and non-ferrous metals. The tool features a 0.198-inch counterbore diameter, a 0.111-inch standard pilot diameter, and a straight-cylindrical shank measuring 0.25 inches in diameter. With 2 flutes and a forward cutting direction, it removes material cleanly and accurately. Overall length is 2.625 inches. This counterbore is a single-piece solid construction, meaning the pilot is fixed and non-interchangeable, which keeps concentricity tight during operation.

This counterbore is suited for machining operations requiring a recessed seat to accept a number 4 fillister-head screw. Typical applications include production machining, maintenance and repair operations, and toolroom work where a controlled counterbore depth and diameter are required. It fits standard drill press, milling machine, or CNC setups using a 0.25-inch shank holder. The straight-cylindrical shank provides a secure grip in conventional chucks or collets.

Key Features

• High speed steel construction for durability in metal cutting applications
• Fixed standard pilot diameter of 0.111 inches maintains concentricity with the drilled hole
• 0.198-inch counterbore diameter sized for number 4 fillister-head screw compatibility
• 2-flute geometry promotes chip clearance and smooth cutting action
• Straight-cylindrical 0.25-inch shank fits standard chucks and collets
• Forward cutting direction for conventional rotary tool setups

Compatibility

Designed for use with number 4 fillister-head screws. Counterbore diameter and pilot diameter are sized to produce a standard recessed seat for this fastener type in typical machining operations.

Installation Notes

This tool is installed and operated by machinists using a drill press, milling machine, or CNC spindle with a compatible 0.25-inch chuck or collet. Ensure the workpiece is securely fixtured before engaging the cutter. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain surface finish. Always bring the spindle to a full stop before inspecting the counterbore depth.