5305-00-497-4085 (FFS107TYPEBSTYLE9S)
NSN 5305-00-497-4085 (NIIN 00-497-4085) 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 FFS107TYPEBSTYLE9S (Federal Specifications Promulgated, CAGE 81348); also referenced as PK55Z8-4 (Usm Corp Sub Of Emhart Industries).
Key specs: case-hardened; full characteristics table below. NIIN assigned January 1960; DEMIL A (none required). Related NSN 5305-00-057-9610.