Value Collection GH8840209 Counterbore 5/16in 4 Flute

Product Description

The VALUE COLLECTION GH8840209 is an interchangeable pilot counterbore designed for aircraft-style drilling applications. Built from high speed steel with a bright, uncoated finish, it delivers reliable cutting performance in metal fabrication and aerospace-adjacent work. The tool features a 5/16-inch counterbore diameter, a 1/4-inch straight shank, and four flutes for efficient chip evacuation. With an overall length of 2.375 inches, it fits standard drill press setups and hand-held power tools. Licensed HVAC, mechanical, and aviation-adjacent maintenance technicians as well as machinists will find this a practical addition to their counterboring toolkit.

This counterbore is suited for applications requiring precision seat preparation in metal components, particularly where interchangeable pilots allow flexibility across pilot shank diameters. It is compatible with a 3/32-inch pilot shank diameter, making it appropriate for aircraft-style counterbore work on aluminum, mild steel, and similar materials. The right-hand cutting direction and polished flutes support clean entry and minimal burring on finished workpiece surfaces.

Key Features

• 5/16-inch counterbore diameter for precise seating
• 1/4-inch straight shank for broad tool holder compatibility
• Four right-hand flutes for efficient chip removal and clean cuts
• High speed steel construction for durability in metal cutting applications
• Aircraft style design with interchangeable pilot for flexible use
• Bright, uncoated finish suitable for general-purpose metal machining

Compatibility

Compatible with 3/32-inch pilot shank diameter. Designed as an aircraft-style interchangeable pilot counterbore for use in standard straight-shank tool holders accepting a 1/4-inch shank.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance technicians familiar with rotary cutting tools. Secure the workpiece firmly before operation and confirm the tool holder is properly tightened to the 1/4-inch shank before running. Always follow applicable shop safety standards and use appropriate eye protection and cutting fluid when working with high speed steel tooling on metal stock.