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 5999-01-495-0130
NSN 5905-01-128-0662
NSN 6110-01-633-9660
NSN 6105-01-264-2630
NSN 5990-01-487-0871
NSN 5950-01-013-9013
NSN 6610-01-102-0194
NSN 6240-00-789-3370
NSN 5975-00-246-4906
NSN 6130-01-533-1619
NSN 7035-00-916-9380
NSN 5915-00-937-4440