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 6110-01-359-2743
NSN 6220-01-610-4662
NSN 5910-01-018-7885
NSN 5915-00-967-1925
NSN 5990-01-328-9846
NSN 6645-01-014-0793
NSN 6610-01-226-8582
NSN 6610-01-013-8922
NSN 6135-01-437-6409
NSN 5999-01-033-5474
NSN 5985-01-480-7444
NSN 6320-01-064-0372