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 6685-01-483-7538
NSN 5915-01-561-4967
NSN 2925-00-989-0523
NSN 6145-00-635-7920
NSN 6645-01-158-8136
NSN 5910-00-925-9392
NSN 5905-01-656-5531
NSN 6620-01-158-5111
NSN 6240-01-381-8713
NSN 6620-00-891-8584
NSN 6135-01-413-4747
NSN 5998-00-761-8201