Well, this is what Wikipedia says:
https://en.m.wikipedia.org/wiki/Auto...y_power_outlet
Quote:
12-volt cigarette lighter receptacle and plug, size A:- Receptacle inside diameter: 20.93–21.01 mm (median 20.97 mm)
- Plug body diameter: 20.73–20.88 mm (median 20.805 mm)
- Most often used in American automobiles
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versus
Quote:
12-volt cigarette lighter receptacle and plug, size B:- Receptacle inside diameter: 21.41–21.51 mm (median 21.455 mm)
- Plug body diameter: 21.13–21.33 mm (median 21.18 mm)
- Most often used in European automobiles, and sometimes as a second socket in American automobiles expressly for DC power connections.
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