A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 6645-01-244-4881
NSN 5985-01-443-3287
NSN 5975-01-572-9783
NSN 5895-00-351-7463
NSN 6110-01-569-7172
NSN 5965-01-009-5758
NSN 5990-01-080-0097
NSN 5999-01-534-6389
NSN 5950-00-717-9273
NSN 5925-01-317-1828
NSN 5855-00-011-5816
NSN 6685-01-160-1710