5306-00-558-8212 (FFS85)
NSN 5306-00-558-8212 (NIIN 00-558-8212) is a machine bolt in Federal Supply Class 5306, Bolts — an externally threaded fastener designed for insertion through holes in assembled parts and normally intended to be tightened or released by torquing a nut. Manufacturer part number FFS85 (Federal Specifications Promulgated, CAGE 81348); also referenced as SW105-654 (Ordnance Supply Office).
Key specs: finished head; 100 rockwell b maximum overall hardness; full characteristics table below. NIIN assigned January 1963; DEMIL A (none required). Supersedes 5306-00-282-9643 (1963); related NSN 5305-00-225-9093.