E’ Series actuators incorporate a body of cast aluminium and have pistons where the rack teeth are precision machined onto the aluminium casting. Spring return versions have a maximum of 6 springs, 3 in each end cap assembled as a concentric stack.
P’ Series actuators cover the large end of the torque range. These all incorporate a body of cast aluminium and have steel for the rack on the pinion drive. Spring return versions have a maximum of 14 springs 7 in each end cap assembled within a hexagon pattern.