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 5990-00-827-4891
NSN 5835-01-482-1591
NSN 6685-00-596-8765
NSN 5990-00-455-9865
NSN 6145-00-234-5002
NSN 6220-00-113-0063
NSN 6135-01-633-2066
NSN 5895-01-319-2823
NSN 6220-01-391-7705
NSN 6685-01-113-8985
NSN 2925-01-554-5246
NSN 5996-01-492-6330