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 5835-01-541-9991
NSN 2925-00-480-9068
NSN 5998-01-469-6363
NSN 5915-01-147-6098
NSN 6645-00-172-8718
NSN 2925-00-596-9775
NSN 5835-00-614-0650
NSN 5990-01-101-7602
NSN 6610-00-908-3698
NSN 5998-00-878-4961
NSN 5998-01-282-4220
NSN 6650-01-571-7122