.0781" (5/64") Cutter Diameter X .3120" (5/16") Flute Length X .6250" (5/8") Reach Carbide Flat Bottom Counterbore, 4 Flutes, Altin Coated. The Flat Bottom Design Featured In This Harvey Tool Product Offering Of Counterbores - Flat Bottom Allows For Spot Facing Or Counterboring On Irregular Surfaces. This Tool Is Ideal For Castings, Rounded, Concaved Or Drafted Part Surfaces.

• Counterbores - Flat Bottom - Long Reach
• Undersized neck to avoid heeling
• Flat Bottom (No Dish) design allows spot facing or counterboring on irregular surfaces
• Ideal for castings, rounded parts, concaved or drafted surfaces
• Can be used for flat bottom reaming or straightening misaligned holes
• Center cutting
• Ground with full cylidrical margin (not side cutting)
• 15° Helix
• 4 Flutes
• Solid carbide
• CNC ground in the USA

This item is part of our complete offering of Harvey Tool Specialty Carbide Cutting Tools, trusted for precision CNC machining, miniature tooling, and hard-to-find specialty profiles. Explore our full selection of Harvey Tool Miniature End Mills for high-performance milling, or search all sizes and styles of Harvey Tool Carbide End Mills, including miniature and specialty geometries. Browse Harvey Tool Hole Making Tools for drilling and finishing applications, Harvey Tool Threading Tools for taps and thread mills, and Harvey Tool Specialty Cutting Tools for complex part geometries and unique machining solutions. Known for their industry-leading selection of miniature and specialty carbide tools, Harvey Tool delivers exceptional accuracy, surface finish, and extended tool life across a wide range of materials. Visit our main Harvey Tool Cutting Tools page to compare sizes, coatings, geometries, and performance options to find the right tool for your application.