In 1958, Fiat introduced its first proper model series: before these models, there was only the 25 R. The best-known models included the 211R, 312R, 411R, and its four-wheel-drive version, the 441R. The Piccola, or 211R, had numerous parallel versions, for example, for viticulture and fruit growing. For row crops, there was a version with a track width increased to 2 meters or a ground clearance of 1.38 meters. Additionally, there was the frame-steered 251R. The lineup also included the 211Rb (22 hp) equipped with a 1.2-liter gasoline engine. Larger models had crawler tractor versions (e.g., the 411C). In the USA, the 411R was known as the Oliver 411R, and with a gasoline engine as the 411RG.

Fiats were equipped with relatively small pre-chamber diesels by displacement and had a 6+2 transmission. All models came standard with a differential lock. The electrical system was 24 volts. Fiat tractors did not have a weight transfer system. Such a system was introduced around 1961, except for the 211R. At the same time, the road speed of the 312R and 411R increased from 22 km/h to 26 km/h.

In 1961, the 513R, known as the "Ukko-Fiat," came to Finland. It was actually a model developed by OM, a subsidiary of Fiat, preceded by the OM 50 and OM 512R. The design now followed the new Fiat model lineup. The 513R was equipped with a 4.2-liter, 62 SAE hp direct-injection diesel engine. It had 7+2 gears. In tight situations, the clutch could be locked momentarily in a half-engaged position, reducing the tractor's speed and increasing torque. The lift was equipped with a Control Matic draft control system.

The 312R was also marketed in Finland under the name Fiat 35, and the 411R as the Fiat 45. In the early 1960s, Fiat sales in Finland were about one-tenth of Massey Ferguson's or Ford's sales. However, Fiats proved to be durable tractors and laid the foundation for later success.

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