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 6150-01-575-1480
NSN 5930-01-594-3665
NSN 5925-01-340-1185
NSN 5935-01-269-5182
NSN 6650-01-378-6868
NSN 5999-01-525-7505
NSN 6620-01-502-7105
NSN 6685-01-580-1630
NSN 5945-01-054-5556
NSN 5935-00-354-2096
NSN 6650-01-376-6965
NSN 6220-01-334-0613