The helical hydraulic rotary actuator is completely different from traditional oscillating actuators. Compared with the pinion and rack oscillating actuators and the rotary vane oscillating actuators, the helical hydraulic rotary actuator has obvious advantages. It features the most compact configurations, high safety, no-maintenance, high pressure, no-leak, high torque output and small placeholders. It has a big power and a precise positioning, and it’s also simple to control and can be positioned accurately. The helical hydraulic rotary actuator is used at almost all sites which need high torque, such as port machinery, construction machinery and equipment, construction machinery, ship, tunnel work, aloft word, exploratory machinery under-sea and offshore platform, special type robot, transportation, farming and forestry machinery, food industry, tobacco machinery, pharmacy industry, petrochemical industry and so on. Major types offer 0°~360° Conner. Our company is known of the original design of the helical hydraulic rotary actuator and construction machinery accessories. It can offer high torque in compact space, special holding power, and credible function.