DC 12V 10RPM 40Kg.cm 8mm Single Shaft Self-Locking Reversible Worm Gear Motor with Cable, High Torque Speed Reduction Motor, Turbine Electric Gearbox Motor

I got the 10rpm one they have a lot of power well made. Mine were only tapped on shaft side. I just tapped out other side myself with 4mm tap.

Update: I have discovered in real world application that the 250RPM motor is stalling despite the production testing success. Not the fault of the motor though. I didn’t calculate the required torque to extended the solar panels. Going to replace it with the 110RPM version or even the 60RPM to get the required torque, albeit at a slower extension/retraction speed. I am surprised that forward/reverse directions have different speeds and torques, although the specs do mention that. Used this on a retractable antenna for my RV among other projects. I love this motor, have used 5 of these. It is high torque, works well in this application. My only complaint: WISH THE SHAFT WAS LONGER. For outdoor use, I place it inside a motor shroud. Problem is there's not much shaft left to protrude for the shaft coupling to grab. Typically I drill a detent hole in the flat part of shaft and mount a set screw in the coupling to grab it. Haven't found a shaft coupling yet specifically for the 8mm D shaft that the motor has.

Great motor works perfectly for what I needed

High power. Low noise. Solid build.

This motor is powerful. quite and most of all reliable. Great for many projects you might have.