A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 5990-00-201-1162
NSN 5999-01-625-6075
NSN 5975-01-133-6689
NSN 5855-00-688-9954
NSN 5990-01-649-0635
NSN 6620-00-111-4506
NSN 5905-01-053-0953
NSN 5945-01-414-2130
NSN 7035-00-088-7355
NSN 4140-00-966-5762
NSN 5925-01-168-7812
NSN 5965-00-689-1545