... ,ensure high precision, high load .Stepping motor connect with rotation units by high quality elastic counplings,remove backlash error of ... interface, convenient for signal output ,application for handwheel by manual and motorized by hand,reloading actuator motor Specification ModelRSA60RSA100RSA200RSA400Rotation ratio90 ... center load(kg) 30506080Weight (kg)11.547.719.75 motorized rotation stage