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 5998-00-083-8584
NSN 6145-00-458-2338
NSN 5998-01-520-9064
NSN 6150-00-107-2354
NSN 4140-00-193-0067
NSN 5925-00-767-0284
NSN 6685-00-186-9190
NSN 5935-00-633-8302
NSN 5985-00-226-5627
NSN 6685-01-464-1304
NSN 5920-01-459-9872
NSN 5975-01-627-5393