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 5945-01-321-8025
NSN 5930-01-234-1161
NSN 5920-01-587-9083
NSN 6685-01-043-9162
NSN 6135-01-174-3807
NSN 5835-00-393-1996
NSN 6685-01-115-5288
NSN 5998-01-302-5399
NSN 6110-01-223-8095
NSN 5925-01-594-1873
NSN 5998-01-113-7997
NSN 6685-01-461-5193