A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 5905-01-262-2835
NSN 6650-01-486-7221
NSN 5950-01-054-4127
NSN 5895-01-120-8431
NSN 5965-00-963-1796
NSN 5925-01-040-4047
NSN 5930-01-615-5165
NSN 5996-01-442-5218
NSN 6620-01-646-8593
NSN 6105-00-459-5261
NSN 6220-01-247-4380
NSN 6145-00-964-8859