Pneumatic Rotary Actuator Double-acting Rack-and-Pinion Air Cylinder Bore Diameter 20mm

Was looking for a 180-degree rotation in a pneumatic actuator without spending a fortune doing so for an instrument demonstration. My search led me to this tiny actuator which I couldn't find much information on it. The price was inexpensive enough to experiment with.It arrived quickly in a cardboard box without any paperwork or instructions. You are completely on your own for figuring out bolting dimensions. Any adaptors and mounting parts needed to use it are entirely up to you to fabricate. I hope you have skills.There also was no pressure data beyond a maximum pressure warning label so I played it safe and kept the supply pressure well below max at or below 30psig. It strokes fast, real fast but it does seem to have internal spring bump stops.Quality is marginal, body is extruded aluminum and the ends are cast aluminum. Drive pinion is steel with an aluminum ring adaptor attached. Don't know the quality or hardness of the internal steel parts but being Chinese the assumption is low quality soft steel. Threading is metric but the mounting holes that appear to be a NUMAR placement are not. They are slightly off which required modifications to a NUMAR bracket to fit on this actuator. Stroke is adjustable but does not comply with VDE/VDI 3845 mounting. Pneumatic ports are tiny using a 1/16 threads I ended up using push lock fittings with 1/16" flex tubing.It works for the very lite duty I'm going to use it for but I don't see it surviving manufacturing production work for very long. A hard day of production work I see this little actuator falling apart by the end of the 1st shift.