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 6220-00-285-8104
NSN 5950-01-005-1730
NSN 6610-00-236-2219
NSN 6135-01-100-3593
NSN 6110-01-464-0995
NSN 6220-01-634-0660
NSN 5999-01-506-2024
NSN 5950-01-459-7961
NSN 5965-00-568-5802
NSN 5998-01-629-9279
NSN 5915-01-158-5602
NSN 5999-00-258-3712