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.)
Brazil 
France 
Greece Classification: Nuts of iron or steel
NSN 7035-01-026-1171
NSN 5895-01-621-6673
NSN 5990-01-424-2954
NSN 6135-01-056-4609
NSN 7035-00-205-1932
NSN 5915-01-021-0160
NSN 7035-01-386-5722
NSN 5950-01-415-5752
NSN 6145-01-181-5936
NSN 7035-01-254-3044
NSN 6240-01-457-5672
NSN 5905-01-099-7336