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 6610-01-257-5808
NSN 4140-01-327-3241
NSN 5999-01-654-4775
NSN 5855-00-973-5717
NSN 5985-01-321-1922
NSN 6220-01-619-2512
NSN 5965-00-815-2525
NSN 5990-01-641-0123
NSN 5985-01-633-8027
NSN 6685-01-272-9247
NSN 5915-01-115-5120
NSN 6645-01-169-3978