5305-00-941-9458 (FFS85)
NSN 5305-00-941-9458 (NIIN 00-941-9458) is a hexagon head cap screw in Federal Supply Class 5305, Screws — an externally threaded fastener designed for insertion into holes in assembled parts. Manufacturer part number FFS85 (Federal Specifications Promulgated, CAGE 81348); also referenced as MS51095-366 (Military Standards).
Key specs: 25 to 34 rockwell c overall hardness; full characteristics table below. NIIN assigned December 1965; DEMIL A (none required).