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 6650-01-308-5169
NSN 2925-01-170-1089
NSN 6650-01-326-3799
NSN 5998-01-182-8112
NSN 7035-01-333-4203
NSN 5950-01-183-6546
NSN 5998-01-315-2741
NSN 5915-01-083-0070
NSN 6110-00-663-4054
NSN 6110-01-053-0041
NSN 4140-00-751-1694
NSN 6645-00-772-0532