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 5950-00-248-9198
NSN 5925-01-323-0113
NSN 5975-00-619-8159
NSN 6240-01-037-2215
NSN 6650-00-156-9292
NSN 5905-00-886-3533
NSN 5910-00-609-2889
NSN 5998-00-542-9656
NSN 5910-00-996-1593
NSN 5950-00-014-0022
NSN 7035-00-270-5519
NSN 6645-01-231-5540