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 6320-01-420-0340
NSN 7035-01-188-5935
NSN 7035-01-052-3815
NSN 6130-01-131-0075
NSN 5985-01-394-5328
NSN 5996-01-378-2432
NSN 5930-00-162-4027
NSN 4140-01-304-7563
NSN 6645-01-220-2838
NSN 5910-01-572-5441
NSN 6610-00-999-1528
NSN 5915-01-041-5871