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 5915-01-386-1084
NSN 2925-01-111-2927
NSN 6145-00-427-7201
NSN 2925-01-372-9455
NSN 5930-01-225-0015
NSN 6645-01-387-2063
NSN 5998-01-341-3911
NSN 6110-00-003-8586
NSN 5835-01-047-8343
NSN 6105-01-519-3558
NSN 5996-01-232-6906
NSN 6610-00-868-9457