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 6105-00-904-8190
NSN 5835-01-079-3658
NSN 5855-01-657-9768
NSN 5835-01-599-1876
NSN 6110-01-364-2145
NSN 6105-00-608-0749
NSN 5905-00-993-6333
NSN 6240-01-655-1352
NSN 6650-00-456-1736
NSN 5920-00-733-8468
NSN 5925-01-519-8048
NSN 5915-01-179-8585