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 6650-00-419-4863
NSN 5895-01-188-8820
NSN 6620-01-539-2729
NSN 5990-00-242-3754
NSN 5930-00-931-9120
NSN 5930-00-555-3007
NSN 6645-00-183-8812
NSN 5945-01-600-8517
NSN 6685-01-414-9703
NSN 5925-01-535-6842
NSN 5996-00-166-0037
NSN 5999-01-656-5582