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 6645-01-393-4037
NSN 5975-01-589-8177
NSN 2925-01-197-7864
NSN 5996-01-423-8452
NSN 5935-00-519-0281
NSN 7035-00-050-9962
NSN 6130-01-330-0251
NSN 6610-01-500-4466
NSN 2925-01-359-9818
NSN 5990-01-516-9665
NSN 5965-01-433-1974
NSN 6645-00-605-8487