Value Collection GH8860025 Solid Pilot Counterbore Hss

Product Description

The VALUE COLLECTION GH8860025 is a solid pilot counterbore designed to create accurate, flat-bottomed recesses for fillister-head screws in metalworking and machining applications. Built from high speed steel, this tool delivers consistent cutting performance across a range of workpiece materials. The counterbore diameter measures 0.155 inches, with a standard pilot diameter of 0.085 inches that keeps the tool centered in the existing pilot hole. The straight cylindrical shank measures 3/16 inches (0.1875 inches) in diameter and fits standard drill chucks and collet holders. With 2 flutes and a forward cutting direction, the tool produces clean, uniform seats. Overall length is 2.5 inches. Installed by machinists and tool-and-die technicians on manual or CNC machines.

This counterbore is sized for Number 2 fillister-head screws and suits precision assembly work where a flush or recessed screw head is required. Typical applications include fixture building, machine component assembly, and production machining where consistent recess depth and diameter are critical. The standard pilot style is appropriate for use in pre-drilled through-holes or blind holes where a pilot is present to guide the tool.

Key Features

• Counterbore diameter of 0.155 inches for Number 2 fillister-head screws
• Standard pilot diameter of 0.085 inches for accurate tool alignment
• High speed steel construction for durability across common workpiece materials
• 2-flute design for smooth, forward-cutting material removal
• Straight cylindrical shank at 0.1875 inches for broad chuck and collet compatibility
• Compact 2.5-inch overall length suited to bench mills and drill presses

Compatibility

Designed for use with Number 2 fillister-head screws. Fits standard drill chucks and collet holders accepting a 3/16-inch straight shank.

Installation Notes

This tool is installed and operated by machinists on drill presses, manual mills, or CNC machining centers. Secure the straight shank firmly in a drill chuck or collet before operation and verify runout before cutting. Power down or de-energize the machine spindle completely before changing tooling. Always use appropriate cutting fluid and workholding to prevent tool deflection and maintain recess quality.