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 4140-01-515-2722
NSN 6145-01-041-6562
NSN 5910-01-385-2479
NSN 6110-01-647-0946
NSN 2925-01-643-8395
NSN 6620-00-555-3992
NSN 6150-01-342-1711
NSN 6645-00-445-8143
NSN 5835-00-257-2852
NSN 5945-00-037-5107
NSN 5960-01-406-4136
NSN 5835-01-424-0054