A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 5985-01-442-7661
NSN 5965-01-359-8172
NSN 2925-00-945-0792
NSN 5905-01-605-8672
NSN 5960-01-641-5493
NSN 6220-01-130-2966
NSN 5835-00-494-8419
NSN 5998-01-459-7121
NSN 6145-01-587-7689
NSN 5945-01-088-6526
NSN 5920-01-609-8608
NSN 6620-01-165-3784