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 5925-00-777-4083
NSN 5855-01-426-5589
NSN 6130-01-135-5810
NSN 5996-00-379-8785
NSN 6135-01-202-8113
NSN 5935-01-571-7646
NSN 5975-00-345-8055
NSN 5996-00-829-6739
NSN 6645-01-086-7668
NSN 7035-00-185-8683
NSN 5925-00-729-9854
NSN 5925-01-649-2982