5310-00-207-6607 (F22NTM40)
NSN 5310-00-207-6607 (NIIN 00-207-6607) is a hexagon self-locking nut in Federal Supply Class 5310, Nuts And Washers — a nut having a flat bottom and 6 sides. Manufacturer part number F22NTM40 (Harvard Industries Inc, CAGE 72962); also referenced as F22NTN40 (Esna, LLC).
NIIN assigned January 1963; DEMIL A (none required). Supersedes 5310-00-826-6458 (1960), 5310-00-622-1725 (1963); related NSN 5310-00-656-0317.