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 5950-01-342-1299
NSN 5960-01-563-4797
NSN 5905-01-520-5054
NSN 6105-00-948-3817
NSN 5915-01-105-6307
NSN 5915-00-019-7564
NSN 6610-01-398-8815
NSN 6135-01-238-2878
NSN 6685-01-515-1137
NSN 5998-00-121-5391
NSN 6145-00-296-0085
NSN 5998-01-171-3777