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 6150-01-474-6532
NSN 5855-00-132-4898
NSN 5915-01-243-3583
NSN 5855-00-896-4047
NSN 5855-01-645-8185
NSN 6130-00-277-7321
NSN 6685-01-331-5415
NSN 5960-00-306-4177
NSN 2925-01-577-0004
NSN 2925-00-808-5077
NSN 6610-01-261-6102
NSN 5975-01-553-0483