U-33 was fitted with five  torpedo tubes (four fitted at the bow and one at the stern), eleven torpedoes, one  SK C/35 naval gun, 220 rounds, and an anti-aircraft gun.
The U-33 submarine had five torpedo tubes, four located at the bow and one at the stern, along with eleven torpedoes, a single SK C/35 naval gun, 220 rounds of ammunition, and an anti-aircraft gun.