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 6105-00-843-0664
NSN 4140-01-520-8920
NSN 5920-01-547-4174
NSN 6110-01-277-0602
NSN 6610-01-089-1018
NSN 5999-01-013-0358
NSN 5855-01-249-0717
NSN 5999-01-232-8666
NSN 6110-01-468-0428
NSN 6110-00-372-4780
NSN 6645-01-534-5545
NSN 7035-00-557-5570