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 6685-01-152-1212
NSN 6620-01-134-7387
NSN 5945-01-293-7439
NSN 5895-01-123-9669
NSN 5945-01-139-7093
NSN 5930-01-383-6204
NSN 2925-01-660-0669
NSN 5910-01-231-3270
NSN 2925-01-078-5702
NSN 6105-01-115-7522
NSN 5925-01-429-0333
NSN 5920-00-236-1118