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 6220-00-187-8569
NSN 5998-00-241-6442
NSN 5996-00-753-1599
NSN 6145-01-440-9983
NSN 5910-01-200-8233
NSN 6105-01-176-4342
NSN 6130-01-474-9968
NSN 6135-00-087-5300
NSN 5996-00-422-3328
NSN 5855-01-449-4058
NSN 6135-01-461-2915
NSN 6130-01-141-7038