Value Collection 08906406 Counterbore Pilot Carbon Steel

Product Description

The VALUE COLLECTION 08906406 is a counterbore pilot used to guide counterbore cutting tools during precision drilling and reaming operations. The pilot aligns with the existing hole to keep the counterbore centered, producing clean, accurate seat cuts for fastener heads and bearing faces. Made from carbon steel with a bright, uncoated finish, this pilot is suited for general-purpose machining work in metal fabrication, HVAC equipment assembly, and mechanical service applications. The 0.625-inch head diameter and 0.3125-inch shank diameter make it compatible with standard counterbore tool sets used in trade and light industrial environments.

This counterbore pilot is used in shops and field service settings where accurate countersinking or counterboring is required for bolt-seat preparation, valve body work, or equipment housing repair. It fits standard counterbore holders designed for pilots of 5/16-inch shank diameter. Machinists, pipefitters, and HVAC equipment technicians who perform precision fastener seating on steel components will find this pilot a direct fit for common bench and drill-press operations.

Key Features

• 5/8-inch head diameter for standard counterbore seat sizing
• 5/16-inch shank diameter fits common counterbore pilot holders
• Carbon steel construction provides adequate hardness for general-purpose use on ferrous materials
• Bright, uncoated finish allows easy visual inspection for wear
• Lightweight at 0.05 pounds for easy handling and tool-change speed

Compatibility

Designed as a standard replacement or spare counterbore pilot for use with counterbore tool sets accepting a 5/16-inch shank pilot and requiring a 5/8-inch head diameter.

Installation Notes

Installation is performed by machinists or skilled tradespeople using a drill press, milling machine, or hand drill with appropriate counterbore tooling. Secure the pilot firmly in the counterbore holder before operation and verify the shank is fully seated to prevent runout. Always power down and lock out equipment before changing or inspecting pilots. Follow applicable shop safety standards and wear appropriate eye protection during all drilling and boring operations.