3/8 in.
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 6645-00-955-7997
NSN 5975-00-487-5381
NSN 5960-01-632-6576
NSN 5985-00-481-9123
NSN 6645-00-070-8277
NSN 5985-01-418-7217
NSN 5930-00-057-0398
NSN 5895-00-756-9721
NSN 5996-00-338-9760
NSN 5935-01-322-5502
NSN 5975-00-308-5138
NSN 2925-00-707-6770