Value Collection GH8790446 Counterbore 11/16 in 3 Flute Hss

Product Description

The VALUE COLLECTION GH8790446 is a 3-flute interchangeable pilot counterbore designed for precision spot-facing and counterboring operations in metal fabrication and machine shop environments. Built from high speed steel with a bright, uncoated finish, this tool delivers reliable cutting performance across a range of ferrous and non-ferrous materials. The 11/16-inch counterbore diameter pairs with a 1/2-inch straight shank for secure chuck engagement. At 5-1/8 inches overall length with a 3-7/8-inch shank length, the tool reaches into recessed work areas without sacrificing rigidity. It accepts interchangeable pilots sized at 3/16 inch for precise bore alignment during installation.

This counterbore is suited for machine shop, maintenance, and manufacturing applications where bolt-head seating, fastener recessing, or spot-facing flat surfaces on castings and plate stock is required. The interchangeable pilot design allows the operator to swap pilots for different bore diameters without replacing the body, reducing tooling costs in high-mix environments. Right-hand cutting direction is standard for use in conventional drill press, milling machine, or CNC lathe setups.

Key Features

• 11/16-inch counterbore diameter for accurate bolt-head recessing
• 3 flutes provide smooth chip evacuation and stable cutting geometry
• High speed steel construction for durability in general machining applications
• Bright uncoated finish suitable for use with cutting fluid or dry cutting
• Interchangeable pilot accepts 3/16-inch pilot shank for bore alignment
• Straight 1/2-inch shank fits standard drill chucks and milling collets

Compatibility

Designed as an OEM-style interchangeable pilot counterbore compatible with standard straight-shank toolholders and drill chucks accepting a 1/2-inch shank; accepts 3/16-inch interchangeable pilots.

Installation Notes

This tool is installed and operated by machinists, tool-and-die professionals, and maintenance technicians using drill presses, knee mills, or CNC machining centers. Secure the straight shank firmly in a keyed or keyless chuck before operation and confirm pilot fit before cutting. Apply appropriate cutting fluid for the workpiece material to extend tool life. Always power down and lock out the machine before changing pilots or removing the tool from the holder.