5306-01-039-9716 (NAS563C19)
NSN 5306-01-039-9716 (NIIN 01-039-9716) is a machine bolt in Federal Supply Class 5306, Bolts — an externally threaded fastener designed for insertion through holes in assembled parts and normally intended to be tightened or released by torquing a nut. Manufacturer part number NAS563C19 (National Aerospace Standards, CAGE 80205).
Key specs: unfinished head; 36 to 40 rockwell c overall hardness; full characteristics table below. NIIN assigned April 1977; DEMIL A (none required).