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 6145-01-485-4593
NSN 5965-01-564-5039
NSN 6685-01-465-3129
NSN 6130-00-217-1081
NSN 7035-01-150-6303
NSN 5999-01-224-7525
NSN 5855-01-624-7115
NSN 5920-00-322-2122
NSN 5935-01-165-9977
NSN 6240-01-518-3874
NSN 5905-00-188-0005
NSN 6645-00-755-9782