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 6610-00-925-0935
NSN 4140-01-176-6876
NSN 5835-01-295-2431
NSN 5990-00-985-1334
NSN 4140-01-173-7867
NSN 5905-01-424-0565
NSN 6105-01-449-2375
NSN 6645-01-128-7866
NSN 6110-01-160-9444
NSN 6220-01-462-1479
NSN 5999-00-922-8368
NSN 6150-01-523-7235