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 5999-01-192-0255
NSN 6645-00-303-7698
NSN 6620-00-720-3278
NSN 5960-00-519-9880
NSN 5985-00-952-1025
NSN 6145-00-280-2154
NSN 6105-01-417-4470
NSN 6645-01-615-9875
NSN 5855-00-014-5008
NSN 5930-01-578-0374
NSN 5920-01-505-3143
NSN 6650-00-629-8027