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 6220-01-474-8247
NSN 5950-00-419-1907
NSN 5905-00-231-5243
NSN 6150-01-398-9850
NSN 6610-01-371-5039
NSN 5998-00-006-9899
NSN 5975-00-892-9085
NSN 6240-01-085-7216
NSN 6650-00-005-8572
NSN 4140-01-576-8826
NSN 6135-01-365-2707
NSN 6610-00-348-2378