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 7035-01-555-7239
NSN 5975-00-728-2904
NSN 6610-01-330-7839
NSN 5985-00-144-8170
NSN 6110-01-400-3622
NSN 4140-01-576-9310
NSN 5905-01-298-2794
NSN 6145-00-036-7085
NSN 5975-01-259-8288
NSN 5895-01-174-5751
NSN 5990-01-478-5389
NSN 5950-00-142-0609