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 5985-01-369-9029
NSN 6105-00-754-8248
NSN 6150-01-178-5926
NSN 6620-01-216-4901
NSN 6685-00-027-4032
NSN 4140-01-474-2931
NSN 6320-00-925-0558
NSN 5905-01-199-2661
NSN 5950-01-104-0427
NSN 6110-01-329-3560
NSN 5920-01-386-4195
NSN 5998-01-013-0750