5306-00-018-1004 (181004)
NSN 5306-00-018-1004 (NIIN 00-018-1004) 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 181004 (General Motors Corp, CAGE 24617); also referenced as FFS85TYPE2STYLE10PGRADE5 (Federal Specifications Promulgated); MS35298-35 (Military Standards).
Key specs: finished head; 23 rockwell c minimum and 30 rockwell c maximum overall hardness; full characteristics table below. NIIN assigned January 1963; DEMIL A (none required).