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 5990-01-548-5979
NSN 5950-00-422-8579
NSN 5950-01-343-6155
NSN 5920-01-060-5429
NSN 5975-00-204-9190
NSN 6220-01-010-8242
NSN 6110-01-083-6797
NSN 5965-01-607-5753
NSN 4140-00-826-4283
NSN 5895-01-474-7323
NSN 6240-01-341-3921
NSN 5910-01-495-1575