The destroyers were powered by three Penhoët boilers delivering steam to two de Laval geared turbines each driving one propeller shaft, rated at 26,000 shaft horsepower (19,000 kW).

The Klas class carried 150 long tons (150 t) of fuel oil and had a range of 1,600 nautical miles (3,000 km; 1,800 mi) at 20 knots (37 km/h; 23 mph).

For anti-aircraft defence, the destroyers were equipped with two Vickers 40 mm (1.6 in) cannon.

The destroyers were armed with two depth charge throwers for anti-submarine warfare and were issued 20 naval mines.

[1] The Klas-class destroyers were sometimes used to escort Swedish ore carriers and German troop transports.