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 6150-01-141-7749
NSN 5915-00-283-4450
NSN 6610-00-255-8770
NSN 5998-00-444-7815
NSN 6110-01-239-9319
NSN 7035-01-643-6559
NSN 6645-00-843-5215
NSN 4140-01-245-3281
NSN 6650-01-435-9377
NSN 5996-01-533-0480
NSN 5910-01-463-2429
NSN 5920-00-416-4030