FF-S-111D, FEDERAL SPECIFICATION: SCREW, WOOD (27 AUG 1974) [NO S/S DOCUMENT]

FF-S-111D, FEDERAL SPECIFICATION: SCREW, WOOD (27 AUG 1974) [NO S/S DOCUMENT]., This specification covers single and double-threaded wood screws with round, flat countersunk and oval countersunk heads having slotted or cross-recessed drives.