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 6240-01-461-9635
NSN 5965-01-322-8136
NSN 5930-01-426-2848
NSN 6135-01-400-2947
NSN 5975-00-426-0657
NSN 5915-01-621-7426
NSN 6620-00-474-9157
NSN 6145-00-144-0918
NSN 5835-01-587-8787
NSN 5975-01-423-3976
NSN 5835-01-386-4027
NSN 6105-01-074-8156