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 6105-00-325-3637
NSN 5925-01-350-3646
NSN 5985-01-168-6020
NSN 5935-00-842-7886
NSN 5930-00-078-6758
NSN 2925-01-048-4006
NSN 5990-01-434-7913
NSN 6135-00-377-9165
NSN 5905-01-600-4592
NSN 5945-01-151-0693
NSN 5945-01-492-6208
NSN 4140-01-464-5932