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 6135-01-067-8331
NSN 7035-01-304-4138
NSN 7035-00-470-4977
NSN 7035-00-679-9027
NSN 5950-01-430-5502
NSN 6645-01-227-2036
NSN 5835-01-220-5093
NSN 5835-01-519-3834
NSN 6105-00-536-4569
NSN 2925-00-459-4519
NSN 6650-00-773-6850
NSN 5945-01-554-9763