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 6150-01-376-9834
NSN 6145-01-323-6509
NSN 6685-00-398-9840
NSN 5835-01-580-7543
NSN 6610-01-033-1327
NSN 6685-01-143-7307
NSN 5925-00-134-9501
NSN 5905-01-529-6604
NSN 5915-01-443-8217
NSN 6610-00-873-6461
NSN 5930-00-205-9801
NSN 2925-00-411-0600