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 6645-01-421-2445
NSN 6650-01-473-7723
NSN 2925-01-040-6354
NSN 5990-01-501-9094
NSN 4140-01-163-8796
NSN 5950-00-148-4498
NSN 6685-00-900-4246
NSN 6110-01-476-7391
NSN 5835-01-632-6627
NSN 5960-01-040-7114
NSN 6320-01-607-1491
NSN 5895-01-082-4065