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 5920-01-183-7938
NSN 6220-01-648-2184
NSN 6320-01-141-3791
NSN 6145-00-608-5484
NSN 5950-01-361-8863
NSN 5996-00-994-3986
NSN 5930-00-625-4755
NSN 5985-00-252-5567
NSN 5895-01-360-5634
NSN 6145-01-629-5342
NSN 5930-00-300-5650
NSN 5975-01-617-1988