Value Collection GH8860017 Counterbore Set 4 Piece Hss

Product Description

The VALUE COLLECTION GH8860017 is a 4-piece solid pilot counterbore set designed for fillister head screw applications ranging from 1/4 inch to 1/2 inch. Each counterbore features a straight shank and a 2-flute cutting geometry, machined from high speed steel for durability across repeated use in metal, wood, and composite materials. This set gives machinists and tool-and-die professionals a range of counterbore sizes in a single package, reducing the need to source individual tools for common fillister head fastener sizes.

This counterbore set is suited for use in machine shops, manufacturing facilities, and production environments where fillister head screws are regularly installed in counterbored holes. The solid pilot design maintains bore concentricity and reduces chatter during the cutting operation. The 2-flute configuration provides clean chip evacuation and works effectively on a manual mill, drill press, or CNC machining center.

Key Features

• 4-piece set covering 1/4 inch to 1/2 inch fillister head screw compatibility
• High speed steel construction for heat resistance and extended tool life
• Solid pilot design for accurate, concentric counterbore cutting
• 2-flute geometry promotes efficient chip clearance
• Straight shank for standard chuck or collet mounting

Compatibility

Designed as an OEM-style replacement and standard fitment counterbore set compatible with fillister head screws from 1/4 inch to 1/2 inch in diameter.

Installation Notes

Installation of counterbores should be performed by qualified machinists or tool operators familiar with rotary cutting tools. Secure the straight shank firmly in a drill chuck or collet before operation and verify spindle speed is appropriate for the material being cut. Always power down and de-energize the machine before changing tools or adjusting the pilot. Use cutting fluid where applicable to extend tool life and improve surface finish quality.