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 6610-01-287-9814
NSN 6650-01-257-3114
NSN 2925-01-327-3069
NSN 5855-01-141-5190
NSN 5925-01-516-6234
NSN 5975-00-876-4299
NSN 5925-00-835-0257
NSN 6105-01-236-9012
NSN 5950-01-411-3552
NSN 5960-01-418-8402
NSN 6610-00-835-7683
NSN 5990-01-182-5913