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 5950-00-900-4688
NSN 6130-00-999-1116
NSN 6320-01-487-0336
NSN 5930-01-183-2185
NSN 5950-00-459-5722
NSN 4140-01-231-4422
NSN 5996-01-258-5888
NSN 5985-00-138-9087
NSN 5996-01-332-8682
NSN 6645-01-400-2119
NSN 6645-01-103-4493
NSN 4140-00-215-8593