The actuators offer 2, 4, or 6-in. stroke lengths with short retracted lengths, and provide 250 lb-f at 1 ips or 500 lb-f at 0.5 ips. Actuators are available with 24 or 36-Vdc motors, with integral auto-reset thermal protectors. End-of-stroke limit switches directly control the motor, with adjustable extended limit switches and adjustable mid-stroke interlock switches available. Additional features include an internally restrained antirotation stainless-steel extension tube, aluminum housing, powdered-metal gearing and self-locking leadscrew, and a load-limiting ball detent clutch. An optional spring-loaded extension tube provides consistent scrubber-head pressure.