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 6150-00-447-1048
NSN 5915-00-923-6551
NSN 5835-00-707-6266
NSN 5855-00-014-5008
NSN 5998-00-411-4965
NSN 5950-01-479-5411
NSN 5998-01-521-3872
NSN 5920-01-355-9264
NSN 5905-00-255-5695
NSN 5996-01-595-4092
NSN 5905-01-283-7084
NSN 6610-00-918-3389