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 7035-00-437-7950
NSN 6145-00-548-7195
NSN 6135-01-226-4071
NSN 6650-01-051-4972
NSN 5965-01-398-0779
NSN 5998-01-388-3784
NSN 5965-00-469-5009
NSN 5835-00-073-0790
NSN 6620-01-438-0415
NSN 6220-00-276-8681
NSN 5960-01-397-1443
NSN 5925-01-517-7229