5306-00-059-7641 (54590-8-29)
NSN 5306-00-059-7641 (NIIN 00-059-7641) 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 54590-8-29 (Sps Technologies, LLC, CAGE 56878); also referenced as GY628-29 (Goodyear Tire And Rubber Co The).
Key specs: finished head; 39 rockwell c minimum and 43 rockwell c maximum overall hardness; full characteristics table below. NIIN assigned January 1963; DEMIL A (none required).