Arvika-Thermaenius's first self-propelled combine harvester was the ST 67. It was equipped with a 55 hp gasoline or diesel engine, a 205 cm cutting width, and either a bagging attachment or a 20 hectoliter grain tank.

In 1957, its successor, the ST 68, was introduced, featuring an increased cutting width of 236 cm. The engines were still 55 horsepower: available were a Kämpers brand 3.1-liter diesel and Ford’s 3.6-liter gasoline engine. The combine did not have a travel speed variator. Instead, the gearbox had 8+2 partially synchronized gears. An unusual technical feature in this combine was a 180 cm wide threshing drum. Equally wide was the single-piece concave. There were six speed options for the threshing drum and four for the unloading drum. The threshing drum was fed by a conveyor belt. The unloading pipe of the grain tank combine was very short and placed low. The cutting table was raised hydraulically.

The flagship in Arvika-Thermaenius’s combine history is the ST 612, manufactured from 1957 to 1962, which was equipped with a 12-foot cutting table. Its smaller sibling was the 10-foot ST 610. The technical differences between these models and the ST 68 are minor. When using 10 and 12-foot cutting tables, a feed drum and straw walker were used. The engine was a 62-horsepower Perkins auxiliary chamber diesel. In certain export markets, including Britain, the combines were sold under the brand Viking. Thermaenius’s color scheme was the same green-yellow as later BM Volvos.

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