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 6685-01-534-7944
NSN 6105-01-158-7618
NSN 6240-00-409-8670
NSN 6220-01-203-8896
NSN 6645-01-311-9004
NSN 6620-01-116-3983
NSN 6685-01-424-0753
NSN 6650-01-429-9242
NSN 5925-00-872-6522
NSN 5996-01-221-6711
NSN 5950-01-291-9416
NSN 5945-00-577-1756