|The original and most common SP "standard" series pump with air cylinder and 1 1/4" stroke. with the highest ratio capable of hydraulic pressures up to 55,000 psig. Compact pumps are used Commonly for bolt tensioning, jacks, punches, holding, presses, torque wrenches, valve actuation and pressure testing, filter presses, clamping, proof and burst testing, metal forming. These pumps are suited for use with de-ionized water & Oil. The SP series with it's many ratios and modification options can be utilized anywhere a source of hydraulic pressure is required. The SP series has all the same characteristic.