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 5950-01-659-6644
NSN 5960-01-188-4558
NSN 6620-00-628-2150
NSN 5990-01-522-6096
NSN 6130-01-384-3290
NSN 6240-01-112-7577
NSN 4140-00-720-4993
NSN 6240-00-244-0483
NSN 5915-00-557-1760
NSN 2925-00-059-7991
NSN 5915-01-305-6516
NSN 5945-01-375-3463