Used on h-3 helicopter
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.)
Classification: Nuts of iron or steel
NSN 5960-00-153-7115
NSN 2925-01-577-7786
NSN 5935-01-354-3218
NSN 5965-01-388-5296
NSN 6650-00-857-2260
NSN 4140-01-331-0844
NSN 6320-01-631-7828
NSN 6610-00-144-7036
NSN 6645-01-172-4477
NSN 4140-01-437-8715
NSN 6320-01-501-7935
NSN 6105-01-197-1653