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 6220-00-202-8591
NSN 6650-00-213-7065
NSN 5855-00-466-2309
NSN 6145-01-362-3374
NSN 5920-01-107-0838
NSN 5905-00-553-9985
NSN 6110-01-548-3598
NSN 2925-01-098-9549
NSN 5950-01-285-5144
NSN 6145-01-188-1530
NSN 5985-01-470-7134
NSN 5998-01-631-4187