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
NSN 6685-00-866-1776
NSN 2925-01-034-3774
NSN 6650-01-472-6753
NSN 4140-00-923-6528
NSN 5945-01-529-9567
NSN 5965-01-202-1007
NSN 2925-01-478-8191
NSN 5835-00-170-5238
NSN 6320-01-607-0347
NSN 6130-01-454-4265
NSN 5990-01-234-8646