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 5965-00-318-6479
NSN 5996-01-219-1850
NSN 5905-01-641-8091
NSN 6130-00-956-3963
NSN 6145-01-494-3798
NSN 2925-01-265-2853
NSN 6620-01-208-5915
NSN 6320-01-082-2459
NSN 6650-01-321-8823
NSN 5950-01-067-7400
NSN 6150-00-432-8542
NSN 6220-01-493-3251