5305-00-356-4286 (A)
NSN 5305-00-356-4286 (NIIN 00-356-4286) 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 A (Usm Corp Sub Of Emhart Industries, CAGE 45722); also referenced as TYPEA (Usm Corp Sub Of Emhart Industries).
Key specs: case-hardened; full characteristics table below. NIIN assigned January 1963; DEMIL A (none required). Related NSN 5305-00-016-4403.