 All of the "Six-Six Fleet" armored cruisers used the same armor scheme with some minor differences, of which the most important was that the two Asama-class ships used less tough Harvey armor. The waterline belt ran the full length of the ship and its thickness varied from 178 millimeters (7.0 in) amidships to 89 millimeters (3.5 in) at the bow and stern. It had a height of 2.13 meters (7 ft 0 in), of which 1.52 meters (5 ft 0 in) was normally underwater. The upper strake of belt armor was 127 millimeters (5.0 in) thick and extended from the upper edge of the waterline belt to the main deck. It extended 65.42 meters (214 ft 8 in) from the forward to the rear barbette. The Asama class had oblique 127 mm armored bulkheads that closed off the ends of the central armored citadel.
