The Type IXB submarines had a range of 12,000 nmi (22,000 km; 14,000 mi) at 10 knots (19 km/h; 12 mph) while on the surface and 64 nmi (119 km; 74 mi) at 4 knots (7.4 km/h; 4.6 mph) while submerged. They had 6 torpedo tubes (4 in the bow, 2 in the stern) and carried a total of 22 53.3 cm (21 in) torpedoes. Unlike the earlier Type IXAs, the Type IXB submarines were equipped with 44 TMA mines as well.