Value Collection GH8830366 Counterbore 9/16 in 4 Flute Hss

Product Description

The VALUE COLLECTION GH8830366 is an interchangeable pilot counterbore designed for precision enlarging and finishing of existing holes in metal workpieces. This aircraft-style tool features a 9/16-inch counterbore diameter, a 1/2-inch straight shank, and four flutes for efficient chip evacuation and smooth cutting action. Constructed from high speed steel, it provides reliable wear resistance across a range of ferrous and non-ferrous materials. The bright, uncoated finish and right-hand cutting direction make it a straightforward choice for machinists and aerospace maintenance technicians working with standard counterbore applications.

This counterbore is suited for use in aircraft maintenance, general machining, and fabrication environments where interchangeable pilots allow a single body to serve multiple hole sizes. The 1/8-inch pilot shank diameter compatibility allows the use of standard interchangeable pilots to guide the tool and maintain concentricity during cutting. With a 4-1/4-inch overall length, it is compatible with common milling machines, drill presses, and CNC setups used in production and repair settings.

Key Features

• Aircraft-style interchangeable pilot design accepts standard 1/8-inch shank pilots for versatile hole sizing
• High speed steel construction provides durability and heat resistance during metal cutting
• Four-flute geometry promotes smooth cutting action and efficient chip removal
• Bright, uncoated polished finish reduces friction and is suitable for general-purpose machining
• Right-hand cutting direction compatible with standard spindle rotation on most machine tools
• 4-1/4-inch overall length accommodates typical workholding setups on drill presses and milling machines

Compatibility

Designed as an OEM-style replacement or standard interchangeable pilot counterbore for use in aircraft-style machining applications requiring a 9/16-inch counterbore diameter and a 1/2-inch straight shank with 1/8-inch pilot shank diameter compatibility.

Installation Notes

This tool is installed by machinists or aircraft maintenance technicians using standard drill press or milling machine toolholders. Power down and secure the spindle fully before changing or seating the pilot in the counterbore body. Verify that the interchangeable pilot is firmly seated and locked before initiating the cut. Follow applicable shop safety protocols and manufacturer guidelines for speeds and feeds based on the workpiece material.