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 6150-01-650-1486
NSN 5915-01-265-0326
NSN 6685-01-430-2447
NSN 6220-01-208-5556
NSN 5930-01-131-2055
NSN 5915-01-422-9979
NSN 5975-01-463-3700
NSN 6105-01-500-8557
NSN 5975-01-512-7555
NSN 6130-01-155-5708
NSN 5950-01-462-0377
NSN 6240-01-554-2229