The 8341-V Vacuum-Compatible Picomotor Actuator with Rotating Shaft is for those applications requiring rotation without translation. Our 0.187 in. (4.76-mm) Model 8341 is ideal for rotating small optical components or mechanical devices from remote locations. The 0.375 in. (9.5-mm) diameter shank lets you mount the Model 8341 just like our other actuators. A convenient flat on the end of the shaft allow solid coupling to external components.