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 5996-01-633-7979
NSN 5975-00-985-2748
NSN 5855-01-568-0387
NSN 5950-01-606-9146
NSN 2925-01-415-2140
NSN 6135-01-618-2199
NSN 6150-00-080-8274
NSN 5935-01-067-9491
NSN 6645-01-648-4439
NSN 6130-00-986-6635
NSN 6145-01-527-6310
NSN 6135-01-400-2947