... .05mm 5,Radial play shaft: ≤0.3mm 6,The gear box can apply to 40ZY,RS-555 motors. 7,When the ... using at low speed,high gear ratio will cause gear motor torque more than 60kgf.cm.At this torque the gears ... be broken easily.Be noted. 8,when install the gear motor please don't let the screws go through into the ... 7mm.lf so the gearbox will be demaged. DC Planetary Geared Motor