Asme b 18.2.2
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 5975-01-407-0557
NSN 5905-01-199-0769
NSN 4140-01-165-0566
NSN 6220-01-607-4046
NSN 4140-01-350-3277
NSN 6110-01-285-8186
NSN 6145-00-840-5577
NSN 5895-01-429-9305
NSN 5925-01-413-1124
NSN 5990-01-277-2118
NSN 5975-01-523-8494
NSN 6645-01-370-4259