Value Collection GH8790370 Counterbore 37/64 in 3 Flute Hss

Product Description

The VALUE COLLECTION GH8790370 is a 3-flute interchangeable pilot counterbore designed for precision counterboring operations in metal fabrication and machining applications. Built from high speed steel with a bright, uncoated finish, this tool delivers reliable cutting performance in production and maintenance environments. It features a 37/64 inch counterbore diameter and a 1/2 inch straight shank for secure tool holder engagement. With a 5-1/8 inch overall length and right-hand cutting direction, the GH8790370 is a standard-geometry tool suited for machinists and toolroom professionals working on ferrous and non-ferrous materials.

This counterbore is used in drilling and boring operations where a flat-bottomed recess is required for socket head cap screws, bolts, or similar fasteners. The interchangeable pilot design accepts a 3/16 inch pilot shank, allowing the cutting head to be swapped or replaced independently of the shank body. Typical applications include fixture building, plate work, and general metalworking in both job shop and maintenance-repair-operations settings. Licensed machinists and toolroom technicians are the primary installers and operators of this tooling.

Key Features

• 37/64 inch counterbore diameter for accurate flat-bottom recessing
• High speed steel construction for durability across ferrous and non-ferrous materials
• 3 flutes for efficient chip evacuation and smooth cutting action
• Interchangeable pilot accepts 3/16 inch pilot shank diameter
• 1/2 inch straight shank for compatibility with standard chucks and tool holders
• Bright, uncoated finish suitable for general-purpose machining

Compatibility

Designed as an OEM-style replacement or standard tooling option for use in drill presses, milling machines, and CNC machining centers equipped with 1/2 inch straight-shank tool holders and requiring a 3/16 inch interchangeable pilot.

Installation Notes

Installation and operation should be performed by qualified machinists familiar with rotary cutting tool safety. Ensure the machine spindle is fully powered down and locked out before mounting or changing the counterbore or pilot. Secure the straight shank firmly in the chuck or collet to the full recommended engagement depth to prevent tool pullout during cutting. Follow applicable shop safety standards and machine manufacturer guidelines for speed and feed selection.