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 6145-01-378-8693
NSN 6650-01-449-7699
NSN 6240-01-508-0456
NSN 5960-01-301-3315
NSN 5998-01-334-4584
NSN 7035-00-507-5380
NSN 5925-00-677-8320
NSN 5950-01-346-6075
NSN 2925-00-435-5604
NSN 2925-00-188-5003
NSN 5915-01-100-1028
NSN 5925-00-713-2646