Carbide-tipped capscrew counterbores have heattreated alloy-steel straight shanks with integral pilots and come in material-specific carbide grades. The pilots come in nominal screw-body diameters and 1/64 and 1/32-in.-oversize diameters. Metric sizes are also available.
The tools feature helical flutes for positive effective rake. The end-cutting edges are sharpened slightly ahead of center for shearing cutting action that eliminates chatter.
Lexington Cutter Inc.