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 6145-01-267-6770
NSN 6220-01-530-2267
NSN 5835-00-119-5585
NSN 5996-00-205-2933
NSN 6105-00-796-7318
NSN 5935-00-018-0967
NSN 2925-00-957-7329
NSN 5990-01-238-1975
NSN 5996-01-252-8275
NSN 6610-00-012-8072
NSN 6145-01-356-1623
NSN 5895-00-518-1593