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 5920-01-442-7685
NSN 5950-00-807-8453
NSN 6130-01-031-0178
NSN 7035-01-386-5722
NSN 5910-01-279-8358
NSN 6650-01-406-5322
NSN 6220-01-520-4763
NSN 5935-01-268-1808
NSN 5975-01-545-0596
NSN 5905-01-527-2225
NSN 6610-01-089-2487
NSN 5996-01-548-3788