Moog Flo-Tork’s Rack and Pinion Actuators

Customers of Moog’s Industrial Group are now benefiting from the additional best-in-class products offered by Moog Flo-Tork, which specializes in the manufacture of rack and pinion actuators. Our engineers work closely with the customer to ensure that the right technology is used to solve the problem at hand.

The basis behind the Moog Flo-Tork Rack and Pinion Actuator is the translation of a linear force into a rotary motion through a rack and pinion mechanism. Rotary motion is accomplished by applying fluid pressure to a cylinder piston which drives a (linear) gear rack. The gear rack then drives a pinion gear mated to it, imparting rotary motion to the pinion shaft. The pinion shaft is mounted between two support bearings and is connected to the load either directly, through a coupling, or by linkage. Actuator output is measured in Newton meters lbs.-in. or lbs.-ft. and is directly proportional to the net applied pressure (Differential Pressure = ? P).

Moog Flo-Tork manufactures rack and pinion actuators both in hydraulic and pneumatic configurations. The pneumatic actuators are capable of producing up to 2,011 Nm (17,800 lb-in) of torque using 6.9 bar (100 psi) air or low pressure hydraulics 17 bar (250 psi). The hydraulic actuators are produced with torque outputs up to 5,650,000 Nm (50,000,000 lb-in) at 207 bar (3000 psi) operational pressures.

The rotary actuators, offered in rotations from a few degrees to multiple turns are able to be made to match the customer’s application. The actuator can be manufactured with adjustable stops for fine tuning the end stop positions and decelerating cushions for slowing the energy in the system at the end of stroke.

For More Information

Please check with our regional experts to learn more.

Europe: Bernhard Zervas, telephone +49-7031-622-219, e-mail

Americas: Allen Ruef, telephone +1-330-682-0010 x222, e-mail:

Asia Pacific: Peter Clements, telephone +61-7-38423134, e-mail:


Allen Ruef has been with Moog Flo-Tork for 5 years as an Application Engineer and currently as a Senior Sales Engineer. Allen has a Bachelors of Science in Mechanical Engineering and 15 years experience in Industrial Automation utilizing pneumatics and hydraulics.