We had these counterbores custom made for us by one of the top tooling manufacturers here in the USA.
These are a 3-flute, interchangeable pilot carbide tipped counterbore. They are built to work with our titanium screws and caged bearings. They will accept pilots with either a 3/32″ or 1/8″ shank depending on counterbore size. Pilots must be purchased separately.
Carbide tips brazed to alloy steel bodies. Polished flutes. Tool diameter tolerance: +.001″/-.000″.
Shank diameter tolerance: +.0000″/-.0005″.
Corner radius: 1/64″.