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 5960-00-960-6805
NSN 5930-01-218-5663
NSN 5895-01-487-2414
NSN 6110-01-487-3916
NSN 5925-01-099-9542
NSN 6105-01-239-4324
NSN 5895-01-566-2045
NSN 6320-00-790-4844
NSN 4140-00-071-2209
NSN 5950-01-094-9691
NSN 6240-00-241-9703
NSN 6645-01-364-0867