Thread series is hf
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 5935-01-066-4126
NSN 5945-00-066-1274
NSN 5960-00-131-6744
NSN 5935-00-445-9045
NSN 5935-01-433-5730
NSN 5925-01-509-5267
NSN 7035-01-359-7460
NSN 6610-01-476-6891
NSN 5975-00-530-3751
NSN 6620-01-346-6575
NSN 5945-00-840-7615
NSN 6105-01-419-8115