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 6620-00-246-5159
NSN 6145-01-292-7702
NSN 6610-01-492-0605
NSN 5925-01-216-2169
NSN 5999-00-358-1933
NSN 6685-00-372-4670
NSN 6150-00-877-3954
NSN 5920-01-147-5652
NSN 5965-00-009-8679
NSN 6105-00-393-2489
NSN 5950-01-467-0394
NSN 5935-01-094-8065