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 5975-00-408-8152
NSN 6130-01-152-2019
NSN 5925-01-422-0431
NSN 5950-01-485-9980
NSN 6145-01-275-7540
NSN 5990-01-280-0321
NSN 5998-00-089-0526
NSN 5930-01-412-3835
NSN 5975-01-534-3769
NSN 5960-00-021-5618
NSN 5920-00-404-1078
NSN 6645-01-478-2140