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In page Japanese battleship Aki:

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The waterline main belt of the Satsuma-class vessels consisted of Krupp cemented armor that had a maximum thickness of nine inches amidships. It tapered to a thickness of four inches (102 mm) at the ends of the ship.[4] A six-inch strake of armor protected the casemates.[1] The barbettes for the main guns were seven–nine point five inches (180–240 mm) thick. The armor of Aki's main gun turrets had a maximum thickness of eight inches (203 mm). The deck armor was two–three inches (51–76 mm) thick and the conning tower was protected by six inches of armor.[4]