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 4140-00-223-5197
NSN 5905-01-141-6434
NSN 6650-00-195-7519
NSN 6685-01-563-5713
NSN 5965-00-961-1627
NSN 5905-00-959-3159
NSN 6320-01-392-3531
NSN 5975-00-229-7420
NSN 6130-01-419-7927
NSN 5905-01-384-5466
NSN 5990-01-079-8643
NSN 5985-00-903-0452