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 6145-01-170-2318
NSN 6105-00-696-8334
NSN 5915-01-065-1127
NSN 6320-01-209-0952
NSN 5999-01-170-4354
NSN 6650-01-493-3660
NSN 6685-01-094-6334
NSN 5855-01-443-2509
NSN
NSN 5920-01-480-8899
NSN 5950-01-051-1887
NSN 5998-01-527-4749