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 6650-01-641-5356
NSN 5905-01-348-5453
NSN 5996-01-322-4838
NSN 4140-00-878-7356
NSN 5965-01-107-0950
NSN 5975-00-248-8565
NSN 5998-00-978-2965
NSN 5855-00-832-6528
NSN 5910-01-087-5516
NSN 5925-00-180-4088
NSN 5985-00-679-5718
NSN 5996-01-218-6118