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 5990-01-231-9608
NSN 5925-01-128-4374
NSN 5835-01-345-0814
NSN 5915-01-406-8554
NSN 6135-01-068-0119
NSN 5975-01-104-5589
NSN 5985-01-520-5857
NSN 6620-01-448-1423
NSN 5905-00-296-8763
NSN 5965-01-422-3232
NSN 5985-01-614-1968
NSN 5915-01-398-0633