Value Collection GH8790271 Counterbore 27/64 in 3 Flute Hss

Product Description

The VALUE COLLECTION GH8790271 is a 3-flute interchangeable pilot counterbore designed for precision counterboring operations in metal fabrication and machining applications. Built from high speed steel with a bright, uncoated finish, this tool delivers consistent cutting performance in ferrous and non-ferrous materials. The 27/64-inch counterbore diameter is paired with a 3/8-inch straight shank, making it compatible with standard drill press and milling machine chucks. Right-hand cutting direction and a polished flute geometry support clean chip evacuation and accurate seat formation. Licensed tradespeople and machinist technicians rely on this style of counterbore for bolt-clearance and fastener-seating work across a range of part thicknesses.

This counterbore is suited for use in machine shops, maintenance facilities, and production environments where standardized interchangeable pilot systems are used. Its 4-1/16-inch overall length provides adequate reach for typical workpiece setups on drill presses, knee mills, and CNC machining centers. The interchangeable pilot design allows the operator to swap pilots to match different fastener shank diameters without changing the body, improving efficiency across multiple job setups. A compatible pilot shank diameter of 5/32 inch is specified for this tool.

Key Features

• 27/64-inch counterbore diameter for precise fastener seat formation
• 3-flute right-hand cutting geometry promotes clean chip evacuation
• High speed steel construction provides durability across a range of workpiece materials
• Bright, polished finish reduces friction and aids visual inspection of cutting edges
• 3/8-inch straight shank fits standard chuck configurations on drill presses and mills
• Interchangeable pilot design allows fast pilot swaps for multi-fastener jobs

Compatibility

Designed for use with interchangeable pilot counterbore systems accepting a 5/32-inch pilot shank diameter. Fits standard 3/8-inch straight-shank toolholders and drill chucks on drill presses, milling machines, and similar machine tool platforms.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance technicians familiar with rotating cutting tool safety. Secure the workpiece firmly before engaging the cutter, and verify chuck grip is tight before spindle startup. Select cutting speed appropriate for the workpiece material and tool diameter per standard machining reference data. Inspect the cutting edges and pilot fit before each use to confirm the tool is free of chips, cracks, or excessive wear.