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 6240-01-423-8642
NSN 5975-01-050-1253
NSN 7035-01-555-8289
NSN 7035-01-645-4885
NSN 6220-01-085-4947
NSN 5945-00-421-7174
NSN 5999-00-990-9083
NSN 6610-00-305-5447
NSN 5999-01-432-0949
NSN 4140-01-108-9084
NSN 6650-00-425-7028
NSN 5925-00-999-9320