Value Collection GH8861643 Solid Pilot Counterbore 3MT

Product Description

The VALUE COLLECTION GH8861643 is a solid pilot counterbore designed for precision counterboring operations in metalworking and machining applications. Built from high speed steel, this tool delivers reliable cutting performance across a range of workpiece materials. It features a 1-9/16 inch counterbore diameter with a standard 1-1/16 inch pilot diameter for accurate hole alignment, and a 3 Morse taper shank for secure mounting in compatible machine spindles. With 3 flutes and a forward cutting direction, it removes material efficiently while maintaining dimensional accuracy in production and maintenance environments.

This counterbore is suited for machine shop use, including job shops, tool rooms, and industrial maintenance operations. It handles standard counterboring tasks such as recessing bolt heads and creating flat-bottomed seating surfaces for fasteners. The 1 inch fastener size compatibility makes it appropriate for heavy-duty bolted assemblies. A licensed machinist or tooling technician typically selects this tool for use on a drill press, milling machine, or lathe with a Morse taper spindle.

Key Features

• 1-9/16 inch counterbore diameter for accurate seat geometry
• Standard 1-1/16 inch pilot diameter for precise hole alignment
• High speed steel construction for durable cutting performance
• 3 Morse taper shank for direct spindle mounting without an adapter in compatible machines
• 3-flute design with forward cutting direction for efficient chip evacuation
• Compatible with 1 inch fastener sizes

Compatibility

Designed as an OEM-style replacement or direct-use solid pilot counterbore for machine spindles accepting a Number 3 Morse taper. Suitable for drill presses, milling machines, and lathes equipped with a 3MT spindle bore.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician familiar with Morse taper tooling. Ensure the machine spindle is fully powered down and at rest before seating or removing the taper shank. Clean both the taper shank and the spindle bore of oil, chips, and debris before insertion to ensure full seating and prevent tool pullout during operation. Secure the pilot in the existing hole before engaging the cutter to maintain concentricity and prevent lateral movement.