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 6105-01-456-1243
NSN 5925-01-170-7899
NSN 6150-00-556-8087
NSN 5835-01-462-5983
NSN 5990-01-534-8609
NSN 5950-01-394-6583
NSN 5915-01-433-3170
NSN 6620-01-208-5915
NSN 6685-01-555-7938
NSN 5895-00-891-9697
NSN 6650-00-557-5482
NSN 5945-00-313-5286