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 5999-00-757-2690
NSN 5855-01-359-8592
NSN 6650-00-641-6139
NSN 5965-01-513-7659
NSN 5925-01-422-4748
NSN 6130-00-452-9464
NSN 2925-00-728-8118
NSN 5930-01-492-6590
NSN 2925-01-523-3607
NSN 7035-01-242-2052
NSN 6220-00-939-1429
NSN 6650-00-074-0131