5306-00-409-3361 (FFB584)
NSN 5306-00-409-3361 (NIIN 00-409-3361) 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 MS35751-134 (National Aerospace Standards); MS35751-133 (Military Standards).
Key specs: 95 rockwell b maximum overall hardness; full characteristics table below. NIIN assigned January 1972; DEMIL A (none required); unit of issue EA (each), $66.60 gov standard price; ships at 0.2236 lb / 0.0026 cu ft. Supersedes 5306-00-059-1296 (2025); related NSN 5306-00-248-8679, 5306-00-514-7531, 5306-00-702-2821.