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 6620-01-525-8648
NSN 6320-01-532-7491
NSN 5930-01-422-1471
NSN 5895-01-518-2296
NSN 6145-01-389-9447
NSN 5930-00-205-2945
NSN 5920-01-372-1322
NSN 5925-00-916-0367
NSN 5895-01-490-5700
NSN 5996-01-309-3602
NSN 5945-01-424-3298
NSN 5999-01-291-0835