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 6220-01-444-3972
NSN 6145-01-474-5459
NSN 5925-01-323-7756
NSN 5998-01-360-6832
NSN 6240-00-495-6763
NSN 5998-00-383-6191
NSN 5915-00-449-1454
NSN 5990-01-087-3103
NSN 6105-01-099-1113
NSN 5915-01-618-1048
NSN 6105-01-572-7492
NSN 6685-01-115-3194