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 5835-01-384-3206
NSN 5960-00-845-4940
NSN 6130-01-086-2565
NSN 5965-00-137-9291
NSN 6645-00-363-9775
NSN 5950-01-266-5692
NSN 5996-00-313-2346
NSN 6145-00-193-9466
NSN 5855-00-004-0904
NSN 5965-01-063-7894
NSN 5920-00-042-6435
NSN 5895-01-461-4611