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 6620-01-624-3933
NSN 6220-01-039-9872
NSN 4140-01-442-6442
NSN 6150-01-306-6911
NSN 5895-01-622-4550
NSN 5930-00-059-7398
NSN 6220-01-028-4488
NSN 6150-01-374-8125
NSN 5925-01-632-6732
NSN 5945-01-327-2697
NSN 5985-01-505-2919
NSN 7035-01-594-9198