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 5945-01-170-7630
NSN 5998-01-069-5575
NSN 6685-01-260-0884
NSN 5950-01-138-0542
NSN 5945-01-311-9980
NSN 5895-01-203-5842
NSN 6220-01-473-2116
NSN 5920-01-510-3933
NSN 5985-01-013-8892
NSN 5905-00-370-2468
NSN 5985-00-778-2888
NSN 6240-00-538-0920