FF-B-575C (NOTICE-2), FEDERAL SPECIFICATION: BOLT, HEXAGON AND SQUARE (09-OCT-2013)
FF-B-575C (NOTICE-2), FEDERAL SPECIFICATION: BOLT, HEXAGON AND SQUARE (09-OCT-2013)., FF-B-575C, dated 04-Dec-2000, remains inactive for new design;however, the document is valid for use.