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 6240-00-123-7648
NSN 5895-01-381-1313
NSN 6145-01-462-5112
NSN 5925-01-140-2773
NSN 6645-00-168-0781
NSN 5855-00-221-9435
NSN 5920-00-705-2916
NSN 6220-00-225-8345
NSN 5835-01-512-4834
NSN 6240-01-487-3840
NSN 5950-00-618-8245
NSN 6110-01-188-9883