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 6650-01-349-2403
NSN 6685-00-068-0933
NSN 6685-01-160-0215
NSN 5905-00-100-3407
NSN 6145-01-364-0346
NSN 6130-01-122-8343
NSN 6610-00-859-6136
NSN 5920-00-445-3585
NSN 5910-01-371-3110
NSN 2925-01-088-9016
NSN 2925-01-647-7225
NSN 5855-01-413-8962