Value Collection GH8862484 Solid Pilot Counterbore Hss

Product Description

The VALUE COLLECTION GH8862484 is a solid pilot counterbore designed for precise enlarging and finishing of bolt-seat recesses in metal workpieces. It accepts 3/4-inch fasteners and cuts a 1-3/16-inch counterbore diameter using a fixed 13/16-inch standard pilot that registers in a pre-drilled hole to keep the tool on-center. Three flutes provide efficient chip evacuation and a smooth, flat-bottomed seat. The straight-cylindrical 1-inch shank mounts directly in drill press chucks or milling machine holders. Constructed from high speed steel, this tool handles general-purpose machining in steel, cast iron, and non-ferrous alloys. Machinists and tool-and-die technicians use it for bolt-clearance finishing operations in fabrication and maintenance shops.

This counterbore is suited for manual drill press work, knee-mill operations, and production boring setups where a consistent, flat recess seat is required for socket-head cap screws or hex bolts with a 3/4-inch nominal diameter. The standard pilot configuration works with through-holes or blind-hole counterboring where the pilot hole has already been sized correctly. It is a single-piece unit sold individually, making it a practical choice for maintenance tooling kits and low-volume specialty jobs.

Key Features

• 1-3/16-inch counterbore diameter creates proper bolt-seat recesses for 3/4-inch fasteners
• 13/16-inch standard pilot registers in the pilot hole to maintain concentricity during cutting
• 3-flute geometry promotes chip clearing and delivers a clean, flat-bottom seat
• 1-inch straight-cylindrical shank fits standard drill press chucks and milling holders
• High speed steel construction provides durability across steel, cast iron, and non-ferrous materials
• Forward cutting direction suits conventional drill press and milling machine setups

Compatibility

Designed as an OEM-style replacement or direct tooling option for counterboring operations requiring a 3/4-inch fastener size compatibility, a 1-3/16-inch counterbore diameter, and a 1-inch straight-cylindrical shank.

Installation Notes

Installation is performed by machinists or toolroom technicians. Secure the 1-inch shank firmly in a properly sized chuck or collet before use, and ensure the workpiece is clamped to prevent movement. Power down and de-energize the machine before changing or inspecting the tool. Do not exceed the recommended feed and speed parameters for high speed steel tooling in the material being cut, and apply cutting fluid as appropriate to extend tool life.