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 6610-00-498-5198
NSN 6130-01-588-0297
NSN 6130-00-815-0307
NSN 5965-01-578-6260
NSN 6105-00-756-9919
NSN 5930-00-526-7645
NSN 5998-00-552-6703
NSN 4140-01-124-1630
NSN 6685-01-142-1969
NSN 5985-01-437-5421
NSN 4140-00-107-8212
NSN 5925-01-422-9802