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 6620-01-515-6269
NSN 6240-01-309-1806
NSN 6610-01-349-6333
NSN 6650-00-684-3060
NSN 5915-01-140-0680
NSN 5960-01-085-4231
NSN 5895-01-416-6243
NSN 5915-01-227-2337
NSN 5999-00-117-4567
NSN 6645-00-843-8837
NSN 6110-00-557-8315
NSN 5975-00-458-3038