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 4140-01-322-7476
NSN 6105-01-370-2574
NSN 4140-01-107-5755
NSN 5915-00-492-7867
NSN 6650-01-514-0240
NSN 5985-00-840-6817
NSN 5965-00-959-4910
NSN 6645-01-437-9017
NSN 5998-01-349-3676
NSN 5930-01-571-7906
NSN 5999-01-447-7855
NSN 6610-01-413-3912