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 6220-00-919-5231
NSN 5855-00-156-5489
NSN 6220-01-164-5228
NSN 6150-01-648-1056
NSN 5950-01-199-3319
NSN 5910-01-152-0083
NSN 5945-01-545-0269
NSN 6650-01-075-5104
NSN 5975-01-438-1121
NSN 6145-00-252-5290
NSN 6130-01-338-1852
NSN 5990-01-255-7387