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 7035-01-129-4667
NSN 6220-01-576-4210
NSN 5920-01-309-1545
NSN 6620-01-158-1266
NSN 5950-01-262-6171
NSN 6150-00-722-7127
NSN 6220-01-448-5438
NSN 5996-01-313-1497
NSN 6650-01-567-8552
NSN 5925-00-245-3391
NSN 5999-00-729-0858
NSN 6620-00-527-6523