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 5965-01-406-6320
NSN 5985-01-388-1273
NSN 5960-00-409-9604
NSN 5895-01-632-7726
NSN 5975-00-686-3504
NSN 5975-00-982-3288
NSN 5945-00-269-5375
NSN 5930-01-204-8792
NSN 5930-01-447-1410
NSN 5950-01-415-0276
NSN 6645-00-983-2046
NSN 6150-01-510-9860