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 6145-00-459-4899
NSN 5960-01-437-5318
NSN 5835-01-469-6009
NSN 6220-01-100-4340
NSN 6110-01-296-0742
NSN 6620-01-234-1799
NSN 5835-01-158-6878
NSN 5915-01-433-9666
NSN 5910-01-541-0156
NSN 5999-01-509-3134
NSN 5965-00-989-9345
NSN 5985-01-227-4261