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 6650-00-364-7866
NSN 5930-01-067-7388
NSN 6610-00-108-9546
NSN 6110-01-299-0669
NSN 6135-01-280-0600
NSN 5975-01-222-0594
NSN 6105-01-069-6302
NSN 6135-01-391-6515
NSN 6240-00-458-4662
NSN 5998-00-801-7925
NSN 5960-01-604-1158
NSN 5920-00-239-6552