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 5945-00-316-4080
NSN 6610-01-641-7448
NSN 6645-01-057-7987
NSN 6620-01-623-5756
NSN 5925-01-354-1129
NSN 6145-00-178-8830
NSN 5835-01-416-6455
NSN 5960-01-205-0386
NSN 5985-01-403-2835
NSN 6645-01-062-6705
NSN 5925-01-641-6549
NSN 5999-01-442-2320