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 5998-01-623-6285
NSN 5950-01-248-3837
NSN 5895-01-468-1752
NSN 6645-01-352-6583
NSN 6220-00-682-8292
NSN 5965-01-362-6705
NSN 6220-00-635-8818
NSN 5935-01-015-7469
NSN 6645-01-023-8020
NSN 6145-01-508-3825
NSN 5990-01-443-2931
NSN 6220-01-217-8632