Value Collection GH8830242 Counterbore 3/8 Inch 4 Flute

Product Description

The VALUE COLLECTION GH8830242 is a 4-flute interchangeable pilot counterbore designed for precision seat cutting in aircraft-style applications. Built from high speed steel with a bright, uncoated polished finish, this tool delivers consistent cutting performance in ferrous and non-ferrous materials. The straight shank measures 5/16 inches in diameter, making it compatible with standard drill press and milling machine setups. The counterbore diameter is 3/8 inches with a 3/32-inch pilot shank diameter compatibility, and the tool runs an overall length of 4 inches. Right-hand cutting direction is standard. Machinists and maintenance technicians working on aerospace, industrial, or general fabrication applications will find this tool suited to repetitive counterbore operations.

This counterbore is intended for use in machine shops, maintenance facilities, and fabrication environments where accurate bolt-seat preparation is required. The interchangeable pilot design allows the cutting head to be swapped out without replacing the full tool assembly, reducing tooling costs in high-turnover operations. Aircraft-style geometry makes it appropriate for countersinking bolt and fastener seats in structural and sheet metal assemblies. It is compatible with standard drill presses, milling machines, and CNC setups that accept a 5/16-inch straight shank.

Key Features

• 3/8-inch counterbore diameter for standard fastener seat preparation
• Interchangeable pilot accepts 3/32-inch pilot shank for flexible tooling configurations
• 4-flute design promotes smooth cutting action and reduced chatter
• High speed steel construction provides durability across a range of workpiece materials
• Bright, uncoated polished finish suits general-purpose machining without coating-compatibility concerns
• Aircraft-style geometry for precise, repeatable bolt-seat cuts

Compatibility

Designed as a direct-fit interchangeable pilot counterbore for use with drill presses, milling machines, and CNC setups that accept a 5/16-inch straight shank and a 3/32-inch pilot.

Installation Notes

This tool is installed and operated by machinists and tooling technicians. Secure the straight shank firmly in the chuck or collet before operation and verify pilot shank seating prior to engaging the workpiece. Power down all machinery and lock out energy sources before changing pilots or inspecting the cutting edges. Do not exceed the recommended RPM range for the workpiece material and tool diameter as specified in standard machining reference tables.