The Size 17 double stack by Haydon Kerk Motion Solutions is a 43mm stepper motor linear actuator. Size 17, 43000 double stack series linear actuators are available in three designs - captive, non-captive and external linear versions. Available in a variety of resolutions, ranging from 0.001524mm to 0.048768mm per step. The size 17 double stack series stepper motor linear actuator delivers force of up to 75 lbs (337N). Typical applications include medical equipment, semiconductor handling, valve control, X-Y tables, hand held instruments, or wherever precise linear motion is required.