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 4140-01-353-5031
NSN 5935-00-596-2684
NSN 6220-00-933-3187
NSN 6145-01-510-3352
NSN 5975-01-170-4598
NSN 5920-01-337-7646
NSN 6110-01-244-7816
NSN 5925-01-589-8222
NSN 6645-01-016-1306
NSN 5925-01-046-7448
NSN 5855-01-566-8574
NSN 5996-01-476-1159