Value Collection GH8830283 Counterbore 7/16 in 4 Flute Hss

Product Description

The VALUE COLLECTION GH8830283 is a 4-flute interchangeable pilot counterbore designed for precision countersinking and seat-facing operations in metal fabrication and aircraft-style applications. The body measures 7/16 inches in diameter with a 5/16-inch straight shank and an overall length of 4 inches. Constructed from high speed steel with a bright, uncoated polished finish, this tool delivers consistent cutting performance in right-hand rotation. It accepts a 1/8-inch pilot shank for guided, on-center cutting. Machinists, tool-and-die workers, and aerospace maintenance technicians will find this counterbore suited to demanding close-tolerance work.

This counterbore is used in applications where a flat-bottomed recess is required around a bolt hole or fastener seat. The aircraft-style designation indicates compatibility with aerospace and precision sheet-metal work where interchangeable pilots allow a single body to serve multiple pilot diameters. It is appropriate for use on ferrous and non-ferrous metals in both production shop and maintenance, repair, and overhaul settings. The interchangeable pilot design reduces tooling inventory and allows quick changeover between pilot sizes on the bench or at the machine.

Key Features

• 7/16-inch counterbore diameter for standard fastener seat applications
• 4-flute geometry for smooth, chatter-resistant cutting action
• High speed steel construction for durability across ferrous and non-ferrous materials
• Bright, uncoated polished finish — no coating to affect dimensional tolerance
• Interchangeable pilot system accepts 1/8-inch pilot shank
• Aircraft-style design meets precision fabrication and MRO requirements

Compatibility

Designed as an OEM-style interchangeable pilot counterbore compatible with standard 1/8-inch pilot shanks; accepts pilots used in aircraft-style counterbore systems requiring a 7/16-inch seat diameter.

Installation Notes

This tool is installed by machinists and precision metalworkers using a drill press, mill, or hand-held power tool with a 5/16-inch straight-shank chuck. Ensure the workpiece is securely clamped before operation and that the correct pilot is seated fully before beginning the cut. Use appropriate cutting fluid for the material being worked to extend tool life and improve finish quality. Do not exceed the recommended RPM range for the material and cutter diameter.