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 5920-01-172-8509
NSN 5999-01-360-4143
NSN 6650-01-355-9097
NSN 5990-00-351-5479
NSN 6320-01-495-0512
NSN 6135-00-593-6831
NSN 6110-00-801-2483
NSN 6610-01-444-8881
NSN 5835-01-208-5649
NSN 4140-01-079-6886
NSN 5990-01-187-5420
NSN 6150-00-311-3105