1/2 FILLISTER COUNTERBORE1/2 FILLISTER COUNTERBORE 5-650-100, 1/2 PILOT, 25/32 CUTTING DIAMETER, 2-FLUTE, STRAIGHT SHANK Fillister Head Counterbore,1/2" Pilot, 25/32" Cutter Diameter, 9/16" Shank Diameter, 5-1/4" Overall Length, Imported, 2-Fluted, solid piloted, H.S.S. Fillister Head Counterbores. A fillister head screw is a thick round headed screw that usually has a slotted or phillips drive head. The thicker head allows increase pressure in smaller area's and thus can be assembled close to flanges and raised surfaces where you would also use a counterbore for recessing purposes.
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