A nut, flat on top and bottom, having 4 flat sides. 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 5905-01-493-2892
NSN 6105-01-408-3598
NSN 5930-00-004-9232
NSN 5950-00-557-2012
NSN 5990-01-633-9503
NSN 4140-00-245-2715
NSN 5996-01-457-9158
NSN 5990-00-754-2842
NSN 5996-01-281-7336
NSN 5915-01-633-0799
NSN 5915-01-534-5154
NSN 5996-01-613-6927