5305-00-052-9986 (FFS107)
NSN 5305-00-052-9986 (NIIN 00-052-9986) 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); also referenced as MS24619-54 (Military Standards).
Key specs: case-hardened; full characteristics table below. NIIN assigned January 1963; DEMIL A (none required); unit of issue HD (hundred), $3.46 gov standard price. Supersedes 5305-00-619-5990 (2023).