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 6110-01-142-2550
NSN 2925-01-523-3607
NSN 6610-00-106-3401
NSN 5960-00-167-0397
NSN 5985-00-567-0684
NSN 6145-01-618-1970
NSN 6130-00-949-6466
NSN 4140-00-478-0056
NSN 5935-01-625-5812
NSN 6150-00-361-9880
NSN 5960-01-512-0233
NSN 6220-01-627-9280