"Arizona" carried twelve 45-caliber 14-inch guns in triple gun turrets. The turrets were numbered from I to IV from front to rear. The guns could not elevate independently and were limited to a maximum elevation of +15° which gave them a maximum range of . The ship carried 100 shells for each gun. Defense against torpedo boats was provided by twenty-two 51-caliber guns mounted in individual casemates in the sides of the ship's hull. Positioned as they were they proved vulnerable to sea spray and could not be worked in heavy seas. At an elevation of 15°, they had a maximum range of . Each gun was provided with 230 rounds of ammunition. The ship mounted four 50-caliber guns for anti-aircraft defense, although only two were fitted when completed. The other pair was added shortly afterward on top of Turret III. "Arizona" also mounted two torpedo tubes and carried 24 torpedoes for them.