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 6320-01-549-3153
NSN 5998-01-230-2335
NSN 6650-00-552-8377
NSN 5915-01-283-9538
NSN 6610-00-005-0137
NSN 5835-01-234-3524
NSN 2925-01-088-3612
NSN 5965-01-150-6315
NSN 5935-01-640-7292
NSN 5975-01-344-9760
NSN 5855-01-501-5176
NSN 5990-01-116-2181