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 6220-00-756-5772
NSN 6150-01-181-5612
NSN 5945-00-183-9395
NSN 6105-01-214-4804
NSN 4140-00-289-9263
NSN 5835-00-451-2982
NSN 6135-01-196-7399
NSN 5985-01-432-2240
NSN 5910-01-326-1040
NSN 6685-01-108-5782
NSN 5998-00-904-5314
NSN 6220-00-812-0515