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 4140-01-568-1221
NSN 5965-01-508-1093
NSN 6645-00-776-4462
NSN 5895-00-368-6609
NSN 6645-01-578-6815
NSN 5905-00-617-5102
NSN 6145-00-843-2472
NSN 6620-01-510-3501
NSN 6110-01-498-1354
NSN 5996-01-037-6786
NSN 5998-01-420-5982
NSN 6610-00-253-3549