Value Collection GH8815227 Counterbore 11/32in 3 Flute Cobalt

Product Description

The VALUE COLLECTION GH8815227 is a 3-flute interchangeable pilot counterbore designed for precision countersinking and seat preparation in metalworking applications. Built from cobalt steel, this tool handles hard and abrasive materials where standard high-speed steel bits fall short. The straight shank measures 5/16 inches in diameter and 3-1/16 inches in length, with an overall length of 3-13/16 inches. The bright, uncoated finish provides a polished surface that allows accurate visual inspection of the cutting edges before and after use. Right-hand cutting direction is standard for conventional drill press and milling machine setups.

This counterbore is suited for machine shops, aerospace maintenance facilities, and fabrication environments where precise bolt-hole seat preparation is required. The interchangeable pilot design allows the pilot to be swapped to match different fastener shank sizes without replacing the entire tool body. Compatible pilot shank diameter is 3/32 inches. It is appropriate for use in ferrous metals, stainless steel, and other hard materials commonly encountered in structural and precision machining work.

Key Features

• Cobalt steel construction for durability in hard and heat-resistant materials
• 3-flute geometry for efficient chip evacuation and smooth seat finish
• Interchangeable pilot accepts 3/32-inch pilot shank for flexible fastener sizing
• Straight shank fits standard drill chucks and milling collets without adapters
• Bright uncoated finish allows easy edge inspection and regrinding
• Right-hand cutting direction compatible with standard machine rotation

Compatibility

Designed for use with 3/32-inch interchangeable pilots in standard counterbore pilot systems. Fits drill presses, milling machines, and similar equipment with a 5/16-inch straight shank chuck or collet capacity.

Installation Notes

This tool is typically installed and operated by machinists and tool-and-die professionals using drill presses or milling machines. Secure the straight shank firmly in a properly sized collet or drill chuck before operation, and verify pilot engagement before beginning the cut. Always power down and de-energize the machine before changing pilots or inspecting cutting edges. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain seat finish quality.