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 5855-01-392-3734
NSN 5920-01-458-8075
NSN 5985-01-223-4597
NSN 6650-01-103-7342
NSN 5935-01-256-8879
NSN 6650-01-016-0406
NSN 6240-00-361-1421
NSN 5855-01-482-8290
NSN 5999-01-044-4498
NSN 5999-01-507-7591
NSN 5945-01-095-9256
NSN 6645-00-916-5615