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.)
Brazil 
France 
Greece Classification: Nuts of iron or steel
NSN 6240-01-487-8757
NSN 5835-01-381-2683
NSN 5935-01-611-9375
NSN 5945-01-147-8073
NSN 6135-01-190-2628
NSN 5925-01-284-3369
NSN 5925-01-347-8185
NSN 6105-01-609-0477
NSN 6130-01-477-8066
NSN 5835-01-548-1143
NSN 6240-01-416-0805
NSN 5835-01-412-0344