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 6220-00-352-5962
NSN 6645-00-171-9639
NSN 6220-01-185-3925
NSN 5835-00-969-5771
NSN 5965-00-617-5731
NSN 2925-00-284-1534
NSN 5945-01-514-7952
NSN 5895-00-826-1694
NSN 5990-01-309-3740
NSN 5905-01-146-4076
NSN 6130-01-381-5671
NSN 6240-01-334-6961