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 6220-00-635-8818
NSN 5999-01-188-7225
NSN 6685-01-018-1998
NSN 5975-01-442-5558
NSN 6610-00-705-9502
NSN 5945-00-615-9218
NSN 5975-01-048-0474
NSN 4140-00-267-1129
NSN 5935-01-211-8415
NSN 5935-00-001-8542
NSN 6240-01-434-8083
NSN 6220-00-443-1693