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 4140-00-563-7648
NSN 6620-01-124-0947
NSN 6240-01-129-1688
NSN 6240-01-039-4241
NSN 6240-01-076-5231
NSN 5960-01-536-9763
NSN 5945-00-267-9408
NSN 5998-01-045-4168
NSN 5999-01-138-8294
NSN 6105-01-660-2193
NSN 6320-00-115-0883
NSN 6130-01-648-4169