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 6650-01-615-4237
NSN 2925-01-416-6927
NSN 5996-01-603-0360
NSN 4140-01-485-3321
NSN 6220-01-332-6823
NSN 6240-01-322-4887
NSN 6620-01-324-4708
NSN 5950-00-589-0859
NSN 6150-01-066-7167
NSN 5960-00-521-2560
NSN 5960-01-032-4229
NSN 5835-01-380-5943