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 6685-00-433-7476
NSN 5999-00-556-6313
NSN 5950-01-256-7244
NSN 5990-01-250-4198
NSN 6620-01-012-2852
NSN 6110-00-834-7801
NSN 5960-01-025-2526
NSN 5835-01-468-6170
NSN 6110-00-971-2035
NSN 5998-01-653-3456
NSN 6105-01-146-3543
NSN 5835-00-936-8753