High tonnage hydraulic cylinders, oil return, and locking collar. Thrust force from 50 to 500 tons with stroke range from 100 mm to 300 mm. High tonnage hydraulic cylinders that can be manufactured up to 3000 tons, suitable for lifting, pushing and large lifting operations. Operating pressure 700 bar. The guide surfaces are sized to ensure optimal performance in absorbing the offset load and the end-of-stroke ring nut increases operator safety by avoiding the extra stroke of the piston. These cylinders are equipped with high-resistance seals for maximum durability with use up to 60 ° C, on request it is possible to equip the cylinder with seals resistant to high temperatures up to 200 ° C. Furthermore, the presence of the mud scraper ring avoids contamination by impurities present in the environment of use. The cylinders are equipped with a 3/8 ” NPT female half joint equipped with an anti-dust cap. Removable head with high resistance and possibility to mount a self-leveling head for a better distribution of the load to be lifted. Nitox ONC treatment on all internal mechanical parts for maximum resistance to corrosion and wear. All models are equipped with lifting eyebolts. Sectors of use: steel mills, energy, industry, infrastructure, engineering and testing, mining, shipbuilding, offshore, oil & gas, transport and large lifting. Possibility to design and produce special hydraulic cylinders on request, with dedicated geometries, performances and characteristics. All models can be connected to different drive units such as manual lever pumps or motorized hydraulic power units. A wide range of accessories such as pipes, valves and pressure gauges is available for the composition of the desired hydraulic circuit.