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 6150-00-258-3761
NSN 5915-01-590-4900
NSN 7035-00-162-5487
NSN 5960-01-494-7960
NSN 6130-00-735-8594
NSN 6240-00-297-3919
NSN 6645-01-495-0939
NSN 6645-00-935-7046
NSN 6610-00-753-2281
NSN 5950-00-907-4903
NSN 2925-01-520-4194
NSN 6685-01-471-8417