#4 FILLISTER COUNTERBORE#4 FILLISTER COUNTERBORE 5-625-060, .111 PILOT, 2-FLUTE, STRAIGHT SHANK Fillister Head Counterbore, .111" Pilot, .198" Cutter Diameter, .198" Shank Diameter, 2-5/8" 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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