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 5960-01-291-0479
NSN 5996-00-931-2500
NSN 5905-01-327-3678
NSN 6240-01-401-5340
NSN 6620-01-048-4145
NSN 7035-01-222-0729
NSN 5960-01-171-1664
NSN 6150-01-222-4135
NSN 6240-00-138-3082
NSN 5835-01-152-9483
NSN 6130-00-017-2137
NSN 6650-01-333-1770