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 5895-01-264-5260
NSN 5990-00-104-4903
NSN 5985-01-351-1440
NSN 5960-01-107-3272
NSN 5915-00-676-2056
NSN 6130-01-634-0603
NSN 5996-00-064-7228
NSN 5915-00-955-0547
NSN 6645-01-177-5563
NSN 5920-00-853-8266
NSN 6110-00-071-2023
NSN 5975-01-013-9743