5305-00-281-6005 (FFS107)
NSN 5305-00-281-6005 (NIIN 00-281-6005) is a tapping screw in Federal Supply Class 5305, Screws — a hardened externally threaded fastener whose thread extends to the bearing surface of the head. Manufacturer part number FFS107 (Federal Specifications Promulgated, CAGE 81348).
Key specs: case-hardened; full characteristics table below. NIIN assigned January 1961; DEMIL A (none required).