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 6320-00-216-8779
NSN 6135-00-643-4843
NSN 5925-01-054-3453
NSN 6650-01-244-1573
NSN 6130-01-644-1546
NSN 5950-00-820-6179
NSN 6320-01-191-5036
NSN 6110-01-208-4920
NSN 5915-01-655-9235
NSN 5998-01-106-0428
NSN 6220-00-146-3226
NSN 2925-00-290-7052