I bought this Homend DC12V 12" Linear Actuator with Mounting Bracket for my homemade chicken coop automatic door opener. The Spec is 300mm which is 11.81". The one I received has 11.44" of travel. This length was good for my chicken coop door. Overall length including brackets with boom extended is 31.5"; For me it was it's the limit of what would fit in my chicken coop.It draws between 400mA and 500mA at light load, 0 when it reaches the end of its 30 second mileage period, so about 4mA for opening or closing.When If I could find one that is 1/10 of the rated force, that would be enough. The mounting holes of the bracket are M8 (8mm), which is 5/16". I did the project with Baomain THC15A DC 12V DC 12V Two programmable timers with digital LCD display, 16 amp amps, 35mm DIN rail for installing timers, terminated 12 volt battery and a couple of pieces of wire.
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