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 5960-00-226-8443
NSN 6320-01-240-4637
NSN 6320-01-185-3857
NSN 6610-01-605-1161
NSN 6150-01-267-0635
NSN 5915-00-617-9477
NSN 5998-01-289-7270
NSN 7035-01-658-1623
NSN 5945-00-978-4685
NSN 5835-01-414-3258
NSN 5910-00-431-8973
NSN 6240-01-377-5503