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 5950-00-203-5809
NSN 6135-00-318-8359
NSN 6685-01-071-9963
NSN 5895-01-184-3803
NSN 6610-00-322-2186
NSN 5895-00-859-6600
NSN 6110-01-425-1449
NSN 6240-00-281-8417
NSN 6240-01-361-9167
NSN 5998-01-337-9297
NSN 5985-00-139-1795
NSN 6130-01-359-0016