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 5996-00-912-1602
NSN 5855-01-073-3386
NSN 6145-01-644-4779
NSN 6320-01-429-9871
NSN 7035-01-014-3808
NSN 5925-01-532-8894
NSN 5999-01-389-1886
NSN 5920-01-258-5775
NSN 6645-01-123-3056
NSN 6685-01-208-6022
NSN 5996-00-280-8980
NSN 5855-00-411-8688