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 6610-00-132-1060
NSN 6320-01-268-3072
NSN 6610-01-103-4627
NSN 2925-01-118-6125
NSN 5920-01-116-1789
NSN 5990-01-548-3711
NSN 5998-01-468-6358
NSN 5855-01-656-6808
NSN 6110-00-092-9334
NSN 6220-00-923-9439
NSN 5999-01-057-3478
NSN 6135-00-243-8330