Value Collection GH8830564 Counterbore 7/8 in 4 Flute Hss

Product Description

The VALUE COLLECTION GH8830564 is a 4-flute interchangeable pilot counterbore designed for precision counterboring operations in metal fabrication and aerospace-style applications. Built from high speed steel with a bright, polished finish, this tool accepts a 3/16 inch pilot shank and features a 7/8 inch counterbore diameter. The straight shank measures 1/2 inch in diameter, and the overall length is 5-3/8 inches. The right-hand cutting direction and aircraft-style geometry make it suited for clean, accurate seat formation in structural and precision assembly work. Licensed tradespeople and machinists working in aerospace, general machine shop, and industrial fabrication environments are the primary users.

This counterbore is intended for use in drill press, milling machine, or hand-held drill applications where a precise counterbored recess is required ahead of fastener seating. The aircraft style designation indicates geometry engineered for tighter tolerances and cleaner hole finishes typical of aluminum and steel structural work. It is sold individually and is compatible with standard 3/16 inch pilots used in interchangeable pilot counterbore systems.

Key Features

• 7/8 inch counterbore diameter for standard fastener seat sizing
• 4 flutes for smooth chip evacuation and improved surface finish
• High speed steel construction provides durability across ferrous and non-ferrous materials
• Bright, polished finish reduces friction and aids chip clearing
• Aircraft style geometry engineered for tight-tolerance counterboring
• Interchangeable pilot system accepts 3/16 inch pilot shank diameter

Compatibility

Designed for use with interchangeable pilot counterbore systems accepting a 3/16 inch pilot shank. Fits standard 1/2 inch straight shank toolholders used in drill presses and milling machine setups.

Installation Notes

Installation and operation should be performed by qualified machinists or skilled tradespeople familiar with rotary cutting tool safety. Secure the straight shank firmly in a properly sized collet or chuck before operation, and verify that the interchangeable pilot is seated and locked before starting the spindle. Always power down and de-energize the machine before changing pilots or adjusting tool depth. Follow applicable shop safety standards and equipment manufacturer guidelines for speed and feed selection based on workpiece material.