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 6145-00-738-5601
NSN 5855-01-095-5299
NSN 5920-00-484-5408
NSN 5915-01-530-4117
NSN 4140-00-135-6398
NSN 5895-00-267-7430
NSN 2925-01-058-1718
NSN 6110-01-206-1063
NSN 6150-00-705-5193
NSN 5945-01-584-6018
NSN 6610-00-230-8675
NSN 2925-00-468-5273