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 5975-01-347-4385
NSN 6130-01-284-0269
NSN 6620-00-900-3986
NSN 5915-01-464-1263
NSN 6150-01-445-4003
NSN 5920-01-437-0333
NSN 5996-00-788-1218
NSN 5915-01-014-2289
NSN 5960-01-512-0233
NSN 5945-01-069-6167
NSN 5930-00-556-4508
NSN 6650-00-067-3572