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 6220-01-115-8186
NSN 6240-01-589-6103
NSN 5910-01-409-2852
NSN 5975-01-048-9301
NSN 5925-00-221-8639
NSN 5930-00-139-6663
NSN 5920-01-464-4373
NSN 5945-01-337-6473
NSN 6320-00-593-0379
NSN 4140-01-276-7960
NSN 6610-01-620-2303
NSN 6610-00-216-6538