Value Collection GH8790198 Counterbore 19/64 in 3 Flute Hss

Product Description

The VALUE COLLECTION GH8790198 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 on ferrous and non-ferrous materials. The counterbore measures 19/64 inches in diameter with a 17/64-inch straight shank and an overall length of 3-13/16 inches. The interchangeable pilot design accepts a 3/32-inch pilot shank, allowing the cutter to be paired with different pilot sizes for versatile fitment across varying hole configurations. Right-hand cutting direction is standard.

This counterbore is suited for use in manual mills, drill presses, and CNC machining centers where a precise recessed seat is required for socket head cap screws, bolts, or similar fasteners. The straight shank seats directly into standard collets or drill chucks without an adapter. Typical applications include production machining, maintenance and repair operations, and aerospace-adjacent fabrication work where controlled counterbore depth and diameter consistency are required.

Key Features

• 19/64-inch counterbore diameter for precise socket head fastener seating
• High speed steel construction for durability across a range of workpiece materials
• 3-flute geometry provides smooth cutting action and chip evacuation
• Interchangeable pilot accepts 3/32-inch pilot shank for adaptable use
• Bright, uncoated finish with polished flutes for reduced friction
• Right-hand cutting direction, compatible with standard spindle rotation

Compatibility

Designed as a standard interchangeable pilot counterbore for use with 3/32-inch pilot shanks. Compatible with drill presses, manual mills, and CNC machining centers equipped with collets or drill chucks accepting a 17/64-inch straight shank.

Installation Notes

Secure the straight shank firmly in a collet or drill chuck rated for the shank diameter before use. Ensure the pilot is properly seated and locked before initiating the cut to prevent chatter or runout. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain surface finish quality. Inspect the pilot and counterbore body for wear before each use, particularly in high-volume production environments.