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 5855-00-079-2370
NSN 5965-01-650-9660
NSN 5950-01-460-4717
NSN 6685-01-166-6593
NSN 6240-00-470-4662
NSN 6135-01-307-2749
NSN 5990-00-481-7208
NSN 6610-00-751-7916
NSN 6105-01-482-0415
NSN 5960-01-459-6665
NSN 6135-00-809-2148
NSN 5985-00-939-7495