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 6610-01-593-8179
NSN 5920-00-564-5702
NSN 5990-01-489-0366
NSN 6110-01-188-6683
NSN 5999-00-074-0544
NSN 4140-01-500-5924
NSN 6135-01-062-9356
NSN 6105-01-527-1564
NSN 6645-01-229-8873
NSN 5835-00-770-2843
NSN 5930-01-406-4281
NSN 5835-00-593-6365