Nut is case hardened black oxide alloy steel
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 5935-01-386-6095
NSN 5930-00-116-8924
NSN 5999-01-469-3331
NSN 5950-00-549-4313
NSN 5990-01-645-2592
NSN 6130-00-447-7744
NSN 6135-01-633-8502
NSN 7035-00-731-8729
NSN 5905-01-041-7503
NSN 6105-01-206-4768
NSN 6110-01-641-9608
NSN 5905-01-547-2683