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 5990-01-449-7090
NSN 6145-01-014-8350
NSN 6130-01-472-6009
NSN 6610-01-067-6591
NSN 6110-00-608-0854
NSN 5950-01-359-8952
NSN 6620-01-479-2352
NSN 6240-01-605-7426
NSN 5985-00-824-9413
NSN 5835-00-707-6266
NSN 2925-00-295-8109
NSN 5855-01-426-5589