"U-625" was fitted with five torpedo tubes (four fitted at the bow and one at the stern), fourteen torpedoes, two twin-barrel anti-aircraft guns on the tower upper deck (double 2 cm FlaK 38 MII on double-LM43U mounts), and a single cannon on the lower wintergarten deck (3,7 cm automatic M42U on LM42U carriage).The boat had a complement of between forty-four and sixty.