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 6240-01-453-7614
NSN 6220-01-388-7360
NSN 6240-00-068-5543
NSN 7035-01-027-8569
NSN 7035-01-361-8821
NSN 5925-00-862-0142
NSN 7035-01-485-2134
NSN 5905-01-555-9832
NSN 4140-01-426-8428
NSN 6650-01-641-5356
NSN 4140-00-246-4969
NSN 5990-00-827-3966