Hydraulic cylinders are used to generate linear power in the industry. Cylinders’ size are varied in different industrial applications, so that in most cases, choosing a suitable cylinder is faced with problems. It’s happened as a result of lack of sufficient knowledge for designing suitable cylinders by their pressure and stroke. Gaz Khodro Sepehr company relying on the gained hydraulic knowledge during recent years is able to design and build single acting, double acting cylinders, one-way and two-way cylinders according to the custom pressures and strokes.