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 4140-00-494-2569
NSN 5950-01-177-1695
NSN 5998-01-459-9906
NSN 5985-01-352-5696
NSN 5965-01-580-7754
NSN 5960-01-187-0392
NSN 5975-01-393-3505
NSN 5935-01-474-9671
NSN 6685-01-309-6240
NSN 5990-01-465-9235
NSN 5998-01-519-9273
NSN 5855-01-300-2301