Value Collection GH8830200 Counterbore 5/16 in 4 Flute Hss

Product Description

The VALUE COLLECTION GH8830200 is a 4-flute interchangeable pilot counterbore designed for precision counterboring operations in metalworking and aircraft-style fabrication applications. The cutter features a 5/16-inch counterbore diameter and a 19/64-inch straight shank, with a 4-inch overall length (OAL). Constructed from high speed steel (HSS) with a bright, uncoated polished finish, this tool delivers consistent cutting performance on ferrous and non-ferrous materials. The interchangeable pilot design allows for pilot swaps to match varying hole sizes without replacing the entire tool body. Right-hand cutting direction is standard. Licensed machinists, aircraft maintenance technicians, and tool-and-die professionals are the primary users of this style of counterbore.

This counterbore is suited for aircraft-style assembly work, general machining, and production environments where clean, flat-bottomed seat geometry is required for fastener heads or mating surfaces. The interchangeable pilot system accommodates a 3/32-inch pilot shank diameter, making it appropriate for light to medium counterboring tasks in sheet metal, structural aluminum, and similar materials commonly found in aerospace and industrial maintenance work.

Key Features

• 5/16-inch counterbore diameter for precise fastener seat geometry
• 19/64-inch straight shank for standard toolholder and drill chuck compatibility
• 4-flute design provides smooth cutting action and improved chip evacuation
• High speed steel construction for durability across ferrous and non-ferrous materials
• Bright, uncoated polished finish — no added coating to affect dimensional tolerance
• Interchangeable pilot accepts 3/32-inch pilot shank diameter
• Aircraft style designation for compliance with aerospace fabrication standards

Compatibility

Designed for use with interchangeable pilot systems accepting a 3/32-inch pilot shank diameter. Suitable for aircraft-style counterboring applications as an OEM-style replacement or new installation in standard straight-shank toolholders and drill chucks.

Installation Notes

Installation and use of this counterbore should be performed by qualified machinists or maintenance technicians familiar with cutting tool setup and machine tool operation. Ensure the machine spindle is fully stopped and locked out before installing or changing the pilot or tool body. Secure the straight shank firmly in an appropriate drill chuck or toolholder to the chuck or collet manufacturer specifications. Follow applicable shop safety standards and wear appropriate eye protection during all cutting operations.