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 6130-00-678-3749
NSN 5985-01-441-8471
NSN 6320-01-315-4517
NSN 5935-01-606-2379
NSN 6645-00-690-0423
NSN 5910-01-025-6738
NSN 6135-01-061-1862
NSN 5999-01-050-1344
NSN 6645-01-469-8120
NSN 6650-00-891-7950
NSN 5925-01-123-9381
NSN 5975-00-398-9716