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 5950-00-364-0764
NSN 5950-01-201-0364
NSN 5996-00-067-3652
NSN 6105-01-659-8170
NSN 6110-01-117-3657
NSN 6610-01-641-6196
NSN 6105-01-302-9088
NSN 5905-00-243-9520
NSN 6620-01-256-9703
NSN 5965-00-045-7156
NSN 6610-01-392-5555
NSN 6685-01-641-5357