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 5998-01-439-5857
NSN 6150-01-577-8331
NSN 5935-01-012-2565
NSN 5945-01-596-2870
NSN 6105-00-596-9962
NSN 2925-01-394-5650
NSN 5910-00-829-3858
NSN 5999-01-652-1255
NSN 6220-01-432-0089
NSN 5905-01-287-6601
NSN 6620-00-155-2608
NSN 5910-00-942-8453