Underwater life support iaw navsea instruction 10560.2b
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 6620-01-627-0478
NSN 5930-00-171-5087
NSN 6645-01-302-9608
NSN 5950-01-198-9152
NSN 6145-01-474-5459
NSN 5925-00-960-5214
NSN 6145-00-681-1585
NSN 6620-01-217-3216
NSN 5996-01-496-5949
NSN 6610-00-056-5889
NSN 5835-00-124-9995
NSN 5930-00-444-8951