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 6620-01-376-2150
NSN 5990-01-646-6149
NSN 5965-01-657-1503
NSN 5998-01-013-9293
NSN 6145-01-212-3528
NSN 6105-01-528-8027
NSN 6105-01-474-6386
NSN 5998-01-455-6575
NSN 6610-01-280-3429
NSN 7035-01-398-9581
NSN 5915-01-238-3627
NSN 5920-01-375-7099