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 5985-00-189-4186
NSN 4140-01-540-5318
NSN 6105-01-105-2018
NSN 5998-01-580-3618
NSN 7035-01-392-9838
NSN 5990-01-572-3137
NSN 6685-01-580-0669
NSN 6240-01-079-3704
NSN 5835-00-155-1379
NSN 5835-00-561-9994
NSN 6650-01-519-9165
NSN 5935-01-031-0264