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 6645-00-106-0140
NSN 6220-00-464-3959
NSN 6220-01-502-8737
NSN 5920-01-551-1295
NSN 5998-01-562-2624
NSN 5999-00-215-4048
NSN 5855-01-585-1255
NSN 5920-01-106-9018
NSN 6130-01-457-6166
NSN 5996-00-294-7045
NSN 6130-01-386-8808
NSN 5990-01-434-3469