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 6240-01-231-0452
NSN 4140-01-197-4273
NSN 5905-00-862-5020
NSN 5935-01-585-7018
NSN 5985-00-950-0249
NSN 5999-00-740-8259
NSN 5965-00-866-3371
NSN 6320-01-447-4289
NSN 5965-01-143-9577
NSN 5998-00-298-8881
NSN 5996-01-026-3513
NSN 5985-00-960-1716