5306-00-404-1385 (FFB584)
NSN 5306-00-404-1385 (NIIN 00-404-1385) is a square neck bolt in Federal Supply Class 5306, Bolts — a headed externally threaded fastener whose threaded portion is of one nominal diameter, with a square neck directly beneath the head. Manufacturer part number FFB584 (Federal Specifications Promulgated, CAGE 81348); also referenced as MS35751-54 (National Aerospace Standards); MILB857 (Military Specifications); FFB584TYPE1CLASS1STYLEA (Federal Specifications Promulgated).
Key specs: 95 rockwell b maximum overall hardness; full characteristics table below. NIIN assigned August 1969; DEMIL A (none required); unit of issue EA (each), $1.94 gov standard price; ships at 0.022 lb / 0.0016 cu ft. Supersedes 5306-00-265-0769 (1986), 5306-00-263-6683 (2025), 5306-00-260-7504 (1990) and 1 more; related NSN 5306-00-013-1300.