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SECC is electrolytic zinc-plated steel as specified in the JIS spec, JIS G 3313. In a quick read through that spec, however, I did not find anything that would explain your "F20" callout. If there were an "E" followed by a number, that would refer to the minimum coating mass. Additionally...

Thanks again sreid. I agree with your thoughts on sealing the shaft. A v-ring may be too expensive for us. We might end up having to use an o-ring and taking a hit on torque output due to friction losses. For covering the vent holes, we actually stumbled onto an interesting product made by...

Sreid, Thank you for the info. If it's impossible to seal an enclosure like this, is there any point in sealing the shaft at all? I've used V-ring seals on products in the past and not been particularly impressed with them, so I'm wondering if there's any point in using them if you've got...

I work on a tracking solar concentrator that requires a motor to operate on a rooftop exposed to the elements for 15 years. I suspect that the only way for this to be possible is to seal the motor within an enclosure that mostly protects it from the environment. Our current enclosure design...

I work on a tracking solar concentrator system that currently uses a small (NEMA 17) stepper motor for our actuation. This product is a rooftop system that will be exposed to the environment. We are hoping to achieve a 15-year maintenance-free lifetime for our product. Our duty cycle is...