Value Collection GH8790479 Counterbore 47/64in 3 Flute Hss

Product Description

The VALUE COLLECTION GH8790479 is an interchangeable pilot counterbore designed for precision counterboring operations in metalworking and machining applications. Built from high-speed steel with a bright, uncoated polished finish, this tool delivers reliable cutting performance on ferrous and non-ferrous materials. It features a 47/64-inch counterbore diameter, a 1/2-inch straight shank, and three flutes configured for right-hand cutting. The overall length is 5-3/8 inches, with a shank length of 3-7/8 inches. The interchangeable pilot design allows the operator to swap pilots for different clearance hole sizes without changing the body, making this a versatile addition to any machinist or maintenance professional's toolset.

This counterbore is suited for general-purpose counterboring tasks in machine shops, manufacturing facilities, and maintenance environments. It is compatible with a 1/4-inch pilot shank, making it appropriate for applications where fastener head recessing is required in metal workpieces. The straight shank fits standard drill press chucks and milling machine collet systems. It is typically used by machinists, tool and die makers, and industrial maintenance technicians working with socket head cap screws or similar recessed fasteners.

Key Features

• 47/64-inch counterbore diameter for precise fastener head recessing
• High-speed steel construction provides durability and heat resistance during cutting
• Three-flute geometry supports efficient chip evacuation and smooth cutting action
• Straight 1/2-inch shank fits standard chucks and collet holders
• Interchangeable pilot accepts 1/4-inch pilot shank for flexible setup
• Bright polished finish reduces friction and aids chip flow

Compatibility

Compatible with 1/4-inch interchangeable pilots. Designed as an OEM-style replacement or standard tooling option for counterbore sets using straight-shank, interchangeable-pilot bodies in 1/2-inch shank configurations.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance professionals familiar with rotary cutting tools. Secure the straight shank firmly in a drill press chuck or milling collet before operation and verify the pilot is properly seated and locked before initiating a cut. Always power down and de-energize the machine before changing pilots or inspecting the tool. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain surface finish quality.