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 5990-01-193-0487
NSN 6110-00-421-1650
NSN 5855-01-116-8905
NSN 5835-01-270-7899
NSN 5930-01-062-3887
NSN 5998-00-782-5298
NSN 5935-00-468-7447
NSN 6135-00-194-9354
NSN 6650-01-584-6438
NSN 6685-00-369-0279
NSN 5990-00-116-1919
NSN 5925-01-069-3204