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 5925-01-429-0392
NSN 5998-00-166-4699
NSN 5975-01-573-7027
NSN 5965-01-316-4429
NSN 6650-01-202-9143
NSN 5950-01-458-1311
NSN 5990-01-359-8334
NSN 5975-01-311-3073
NSN 5998-01-464-4155
NSN 6685-00-777-5731
NSN 5930-00-960-0160
NSN 2925-01-459-8093