Value Collection 08906489 Counterbore Pilot 3/4 in Head

Product Description

The VALUE COLLECTION 08906489 is a counterbore pilot used to guide counterboring tools during precision hole finishing operations. The pilot fits into a pre-drilled hole and keeps the counterbore cutter centered, producing clean, flat-bottomed recesses for socket head cap screws and similar fasteners. Made from carbon steel with a bright, uncoated finish, this pilot has a 3/4 inch head diameter and a 5/16 inch shank diameter. Machinists and tool and die technicians use it in drill press and milling machine setups where accurate bolt-seat geometry is required.

This counterbore pilot is suited for metalworking operations in machine shops, maintenance facilities, and fabrication environments. It is used when a fastener recess must be cut concentrically with an existing hole. The 5/16 inch shank diameter locates the cutter in the pilot hole, while the 3/4 inch head diameter determines the seat diameter cut by the paired counterbore tool. It is sold individually and is appropriate for both production runs and one-off repair work.

Key Features

• 3/4 inch head diameter for counterbore seat sizing
• 5/16 inch shank diameter for precise pilot-hole location
• Carbon steel construction for durability in standard metalworking applications
• Bright, uncoated finish — no coating buildup that could affect dimensional fit
• Sold as a single unit, allowing individual replacement without a full set purchase

Compatibility

Designed as an OEM-style replacement or supplemental pilot for standard counterbore tool sets requiring a 5/16 inch shank and 3/4 inch head diameter pilot.

Installation Notes

Counterbore pilots are installed and removed by machinists or maintenance technicians familiar with rotary cutting tools. Ensure the machine spindle is fully powered down and at rest before changing pilots. The pilot should be seated securely in the counterbore body before starting the cut to prevent runout and tool damage. Inspect the pilot for wear or scoring before each use, as a worn shank will compromise concentricity.