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 6610-01-338-0628
NSN 6610-01-555-0842
NSN 6110-01-513-9907
NSN 6645-01-551-2667
NSN 5945-01-494-0506
NSN 5990-00-683-1095
NSN 6620-00-155-2608
NSN 6620-01-415-8550
NSN 5975-01-459-8525
NSN 6685-01-518-9554
NSN 6220-01-612-2461
NSN 6135-01-582-5987