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 6240-01-336-0816
NSN 6645-01-621-8564
NSN 6685-01-654-5797
NSN 6645-01-437-9017
NSN 5920-00-162-2218
NSN 6320-01-046-5228
NSN 5965-01-306-6527
NSN 4140-01-425-0025
NSN 5925-01-303-0932
NSN 5996-01-599-5712
NSN 6650-00-717-8913
NSN 6610-01-397-6965