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.)
Dept. of the Navy NSN 5835-01-385-0579
NSN 5985-00-225-9993
NSN 5999-01-386-5780
NSN 7035-01-041-2754
NSN 5935-01-435-7375
NSN 5945-01-294-8359
NSN 5960-01-023-1178
NSN 6650-01-412-1040
NSN 5855-01-381-7493
NSN 5925-01-131-9776
NSN 6685-00-731-8633
NSN 6105-01-654-3555