A nut having a sleeve portion on its under side, which can be crimped or clinched to hold the item in place when inserted in a hole.
NSN 6145-01-081-6255
NSN 5895-00-708-6443
NSN 6620-00-083-6456
NSN 6150-01-216-3166
NSN 7035-00-703-3535
NSN 5905-01-589-1569
NSN 6645-00-230-4396
NSN 5999-00-445-4662
NSN 5835-01-279-9508
NSN 5935-00-257-8731
NSN 5920-01-634-0250
NSN 4140-01-127-6112