A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 6645-01-120-7135
NSN 5905-01-371-1341
NSN 6135-00-110-1981
NSN 6105-01-464-0245
NSN 6110-00-494-9135
NSN 6105-00-681-1326
NSN 6645-00-527-6531
NSN 6145-01-584-2334
NSN 5990-00-339-2084
NSN 6645-01-061-2916
NSN 6145-01-116-6729
NSN 7035-01-123-8723