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 5950-00-913-6401
NSN 6320-00-336-9123
NSN 5915-01-588-9844
NSN 5855-01-138-4985
NSN 6320-01-592-6248
NSN 5855-01-371-5645
NSN 5985-01-426-3472
NSN 5998-01-101-7221
NSN 5960-00-040-9989
NSN 5975-01-634-0678
NSN 6105-01-441-2255
NSN 5915-01-098-3014