5307-01-170-3200 (682-550-0007)
NSN 5307-01-170-3200 (NIIN 01-170-3200) is a locked in stud in Federal Supply Class 5307, Studs — a headless fastener externally threaded on both ends with each threaded portion of one but not necessarily the same nominal diameter. Manufacturer part number 682-550-0007 (Honeywell International Inc., CAGE 99193); also referenced as 21130-3 (Stanley Engineered Fastening LLC).
Key specs: 48 to 52 rockwell c hardness; full characteristics table below. NIIN assigned January 1984; DEMIL A (none required).