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 4140-00-172-1804
NSN 4140-01-166-9289
NSN 6135-01-633-8502
NSN 5998-01-153-9260
NSN 6130-00-840-1037
NSN 6220-00-152-7114
NSN 6150-01-247-3650
NSN 5855-00-832-9341
NSN 5945-01-501-5487
NSN 5996-01-276-5680
NSN 5930-01-367-6355
NSN 6320-00-823-2015