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 6610-00-925-5064
NSN 6220-01-056-2056
NSN 6150-01-581-6779
NSN 5905-00-946-9103
NSN 5990-00-518-3195
NSN 5910-01-261-0815
NSN 6610-01-381-3181
NSN 5920-01-554-0891
NSN 5895-00-296-0171
NSN 6240-01-080-0888
NSN 5915-01-245-3403
NSN 6645-01-027-3838