The high-angle machine gun system was similar to that of the 1954 boats, and was equipped with a Mk.1 40mm twin machine gun on the front deck. It was commanded by the Mk.63 Fire Control System (GFCS), with the director on the bridge top and the fire radar on the gun side. In addition, the hedgehog Mk.10 anti-submarine mortar is placed just before the bridge structure behind it, and a 54-type depth charge drop rail (6 depth charges for 1 line) is placed on each side of the stern. Is. However, in the 1954 boats, an anti-submarine short torpedo equipped with a guidance device was adopted instead of the 55-type depth charge projector (so-called Y gun) placed on the rear deck. The two early-built boats used short torpedo projectors that project 483 mm diameter Mk.32 short torpedoes, while the two late-built boats (Wakataka and Kumataka) were made in the United States and 324. It was changed to a 68-type triple short torpedo launcher that produced a licensed Mk.32 with a millimeter diameter. This became standard equipment on the subsequent Maritime Self-Defense Force guard ships, but this class and Mizutori-class submarine chaser were the first equipped boats.
