Many sources conflict on the specifications of the ironclads, even the well-known ones. The facts and figures given below are a result of the comparison of multiple sources, with the most reasonable ones listed.
Some tonnages are highly approximate.
Some specifications varied among sister ships. Armament was known to change throughout service life. This list disagrees with some published sources. The prototype of the turreted armored warship designed by John Ericsson, famous for its duel with the Virginia at Hampton Roads. Sank off Cape Hatteras 31 December 1862, rediscovered in the 1970s.