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 5996-01-241-5255
NSN 6105-00-969-2663
NSN 5998-00-203-1232
NSN 5950-01-204-4500
NSN 5930-00-139-3327
NSN 6145-01-609-7389
NSN 5905-00-651-8753
NSN 5930-01-194-4477
NSN 6685-01-386-8236
NSN 6130-01-423-0270
NSN 6145-01-029-4184
NSN 6105-01-461-8426