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 6620-00-690-3554
NSN 5925-01-463-8594
NSN 6130-01-010-0407
NSN 6130-01-391-1191
NSN 5905-00-077-2994
NSN 5950-01-041-2642
NSN 5950-01-403-2852
NSN 6685-00-058-9526
NSN 6320-00-886-9771
NSN 6135-00-998-5884
NSN 5895-01-574-6065
NSN 5950-00-078-9517