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 5999-01-010-2438
NSN 5985-01-562-2187
NSN 6645-00-623-5052
NSN 5960-00-960-6805
NSN 5950-01-255-1879
NSN 5930-01-013-9251
NSN 6135-01-217-8810
NSN 6240-01-068-3491
NSN 5835-01-108-4980
NSN 4140-01-411-4764
NSN 5998-00-232-7923
NSN 6130-00-596-9565