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 6220-01-253-6684
NSN 5965-01-087-8572
NSN 5990-01-090-3232
NSN 7035-01-573-4671
NSN 7035-01-399-5354
NSN 5930-01-461-8362
NSN 5985-00-332-8758
NSN 4140-00-751-1694
NSN 5996-01-146-5765
NSN 5915-01-051-6068
NSN 4140-00-931-8500
NSN 4140-01-161-2741