Value Collection GH8831125 Counterbore 1-3/16 in 4 Flute Hss

Product Description

The VALUE COLLECTION GH8831125 is an interchangeable pilot counterbore designed for precision counter-boring operations in metal fabrication and aerospace-style machining. Built from high speed steel (HSS) with a bright, uncoated polished finish, this tool features a 1-3/16 inch counterbore diameter and a 1/2 inch straight shank for secure chuck engagement. Four right-hand cutting flutes provide clean, efficient material removal. With a 5-1/2 inch overall length, this tool suits deeper reach applications where standard counterbores fall short. Machinists and toolroom technicians working on aircraft-style assemblies or structural components will find this a reliable production-grade option.

This counterbore is suited for use in drill press, milling machine, or CNC machining center setups where a flat-bottomed recess is required around a bolt or fastener hole. The aircraft style designation indicates compatibility with close-tolerance hole preparation common in aerospace, defense, and heavy industrial fabrication. The interchangeable pilot design allows the pilot to be swapped to match different pilot shank diameter requirements, with a 3/16 inch pilot shank compatibility rating noted for this configuration. It is intended for use on ferrous and non-ferrous metals by qualified machinists and tool and die professionals.

Key Features

• 1-3/16 inch counterbore diameter for precise flat-seat recesses
• 1/2 inch straight shank fits standard drill chucks and collets
• 4 right-hand cutting flutes for smooth, efficient stock removal
• High speed steel construction provides durability in production machining
• Bright uncoated polished finish reduces friction and aids chip evacuation
• Interchangeable pilot design with 3/16 inch pilot shank compatibility

Compatibility

Designed as an interchangeable pilot counterbore for use with standard 1/2 inch straight shank toolholders and compatible pilot sets in drill press, milling, or CNC machining applications requiring an aircraft-style counterbore configuration.

Installation Notes

Installation and operation should be performed by a qualified machinist. Secure the shank fully in the chuck or collet before operation and verify that the pilot fits the pilot hole without excessive play. Ensure the workpiece is firmly fixtured before beginning the cut. Always power down and lock out the machine before changing pilots or inspecting the cutting edges.