How Common are NEMA 6-50 Outlets?

I already have a NEMA 14-50 adapter, but I was wondering: how often do you see 6-50 outlets on the road. I would think a lot of machine shops and garages might have them, because they are used for welders. The adapter is $45, so I was thinking about getting one as an emergency backup.

Basically only for welders, so not that frequently. Where have you seen that you can buy them separately?

I checked with my local service center.

If only I had one... the ATL service center is supposed to open in March. Do they have other adapters available, such as 10-30 and 14-30?

I didn't ask. However I'm not sure I've heard of ANY adapters being available except 14-50, 6-50, 5-15, and J1772.

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