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 6620-01-189-8153
NSN 6650-01-069-4241
NSN 5998-01-372-4758
NSN 5965-01-345-1885
NSN 5910-00-147-9799
NSN 5998-01-365-3605
NSN 5895-01-547-6546
NSN 5996-01-116-3404
NSN 5915-00-849-6667
NSN 5985-01-460-9295
NSN 5975-01-237-4256
NSN 6610-01-168-7943