Do not dupe to nsn 5310-00-903-5966; this nsn is for pearl harbor use only; this is a non-standard unit-of-issue
A nut, flat on top and bottom having 6 flat sides. For items which have internal tapered or straight (parallel) pipe threads, specific electrical conduit size designation, and which when installed, provide a method of tightening to lock the connection, see locknut, electrical conduit. See also locknut, tube fitting. For items having a thickness (or height) exceeding two times the width across the flats, use post, electrical-mechanical equipment. (when height or thickness and/or width across the flats is designated as a tolerance dimension, the maximum dimension will be used to determine compliance.)
NSN 4140-01-054-2279
NSN 6650-00-899-1774
NSN 6110-01-062-0252
NSN 5925-01-602-9311
NSN 5996-01-321-3092
NSN 5895-01-646-6828
NSN 6620-00-252-6425
NSN 5835-01-432-8801
NSN 5855-00-149-0766
NSN 5835-01-238-3381
NSN 5835-01-613-9485
NSN 5965-01-160-2691