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.)
NSN 6650-01-657-1395
NSN 5990-01-400-2195
NSN 7035-01-056-1302
NSN 6135-00-583-3966
NSN 7035-01-633-9537
NSN 5935-00-237-0044
NSN 5945-01-423-7966
NSN 5985-01-442-8381
NSN 6240-01-125-6901
NSN 4140-01-152-8612
NSN 6620-01-146-4680
NSN 6620-00-575-9230