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 6610-01-606-0380
NSN 5996-01-400-3558
NSN 6135-00-062-5080
NSN 5960-00-952-6165
NSN 6610-01-166-4860
NSN 5998-00-709-0613
NSN 5935-01-399-8655
NSN 5905-01-339-2670
NSN 5935-00-755-4456
NSN 5960-01-276-7836
NSN 5996-01-236-3526
NSN 6130-01-449-2738