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 5998-00-529-2551
NSN 6110-01-013-9313
NSN 5920-00-420-3917
NSN 5915-01-604-9868
NSN 6685-01-118-7543
NSN 5975-01-455-3410
NSN 5965-00-208-4896
NSN 5945-01-176-8966
NSN 6105-01-634-0322
NSN 6135-01-070-3865
NSN 7035-01-145-5059
NSN 6220-00-541-8515