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 5920-01-270-4562
NSN 5998-00-186-8583
NSN 5999-01-152-4864
NSN 5985-00-319-5826
NSN 6320-01-036-2598
NSN 6645-01-017-8576
NSN 6240-01-401-5340
NSN 6645-00-163-9580
NSN 5999-01-233-2066
NSN 6145-00-590-8642
NSN 7035-01-344-8708
NSN 6145-00-620-5922