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 5930-01-387-2137
NSN 6650-01-148-5307
NSN 6320-00-905-0543
NSN 5920-00-484-0377
NSN 5925-00-529-0441
NSN 5855-01-175-3990
NSN 6645-00-596-5388
NSN 5935-01-512-8333
NSN 5915-00-824-0196
NSN 5985-00-974-7231
NSN 5998-01-181-6357
NSN 6320-01-305-5881