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 6685-00-492-1357
NSN 2925-01-018-6725
NSN 5905-00-283-4121
NSN 6320-01-334-5305
NSN 6130-01-189-9140
NSN 5985-01-341-6991
NSN 5990-01-205-5937
NSN 7035-01-399-5354
NSN 5920-01-453-2109
NSN 5905-01-169-8887
NSN 6130-00-569-2408
NSN 6150-01-485-2322