5306-01-059-1088 (MS21297-08024)
NSN 5306-01-059-1088 (NIIN 01-059-1088) is a close tolerance bolt in Federal Supply Class 5306, Bolts — an externally threaded fastener whose unthreaded portion is of a specified grip length, plated or unplated. Manufacturer part number MS21297-08024 (Huck International, Inc, CAGE 17446); also referenced as NASM21297 (National Aerospace Standards).
Key specs: 46 to 50 rockwell c overall hardness; full characteristics table below. NIIN assigned April 1978; DEMIL A (none required); unit of issue EA (each), $138.66 gov standard price; ships at 0.18 lb / 0.0029 cu ft.