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 5910-00-150-4700
NSN 6145-00-950-4922
NSN 5990-01-034-6717
NSN 6320-01-605-7059
NSN 5945-01-224-6192
NSN 6620-01-542-9999
NSN 5895-01-013-9320
NSN 5950-01-285-6437
NSN 6105-00-280-2808
NSN 6610-01-605-1509
NSN 6130-01-320-4331
NSN 6645-01-495-0939