A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 6220-00-827-0227
NSN 4140-01-316-2217
NSN 5990-00-702-7789
NSN 2925-01-271-2824
NSN 5910-01-414-5928
NSN 6240-01-548-9846
NSN 5910-00-221-0645
NSN 6645-00-678-9656
NSN 5996-01-423-9423
NSN 5835-01-387-4227
NSN 5965-01-158-4187
NSN 4140-00-990-3311