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 5835-00-283-3616
NSN 5930-00-678-9910
NSN 6135-01-613-9509
NSN 5835-00-621-3720
NSN 5855-01-530-1493
NSN 4140-01-630-1360
NSN 5990-01-278-9985
NSN 6220-01-600-9687
NSN 2925-00-912-0580
NSN 5905-00-355-9609
NSN 6220-00-583-9119
NSN 5975-01-269-8750