"Maya"’s main battery was ten 20 cm/50 3rd Year Type naval guns, the heaviest armament of any heavy cruiser in the world at the time, mounted in five twin turrets. Her secondary armament included eight Type 10 12 cm dual purpose guns with four twin mounts, two on each side, and 16 Type 90 torpedoes in four quadruple launchers. She was very deficient in anti-aircraft capability, with only two anti-aircraft guns. "Maya" was repeatedly modernized and upgraded throughout her career in order to counter the growing threat of air strikes, and in her final configuration was eight 20 cm/50 3rd Year Type naval guns (4x2), twelve Type 89 dual purpose guns (6x2), and 16 Type 93 "Long Lance" torpedoes in four quadruple launchers (plus 8 reloads). Anti-aircraft (AA) protection included 13 triple-mount and 27 single-mount Type 96 25 mm AT/AA Guns (13x3, 27x1) and 36 Hotchkiss M1929 machine gun anti-aircraft machine guns.