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 6135-01-655-1759
NSN 6110-00-230-4509
NSN 5975-01-347-2416
NSN 5998-01-339-6392
NSN 6645-00-248-5434
NSN 6220-01-463-2252
NSN 5996-01-464-5446
NSN 5998-01-626-3205
NSN 6145-01-456-9621
NSN 6135-01-235-4168
NSN 5990-01-176-9731
NSN 6650-01-555-6661