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 4140-01-081-7473
NSN 6220-00-539-8769
NSN 5975-00-905-5194
NSN 5990-01-333-8678
NSN 5855-00-928-1912
NSN 5935-00-678-2390
NSN 5835-00-311-5491
NSN 5925-00-518-9761
NSN 4140-01-321-5784
NSN 5935-00-497-4277
NSN 5965-00-726-3168
NSN 5996-01-432-8216