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 6610-01-590-7222
NSN 5910-00-823-6310
NSN 6105-01-139-3624
NSN 5855-01-493-6639
NSN 5975-01-502-6167
NSN 6620-01-303-2563
NSN 5985-01-264-9758
NSN 7035-01-068-4175
NSN 6130-01-570-3241
NSN 5905-00-140-0570
NSN 6650-00-031-7908
NSN 6320-01-519-8767