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 5835-01-360-2657
NSN 6320-01-259-2604
NSN 5996-01-585-1663
NSN 5985-00-880-5788
NSN 6150-00-287-6879
NSN 6685-01-533-7333
NSN 7035-00-763-6180
NSN 6135-00-160-7708
NSN 7035-01-353-6861
NSN 5920-01-469-0202
NSN 5895-01-398-0063
NSN 5990-00-070-9608