I know that standard incandescent bulbs in the US use Edison screw bases, but I'm not sure which designation / number is the one which is used for prolific non-candelabra 120 volt fixtures.
Electrical – the standard 120V light bulb screw base in the US
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Best Answer
The US 120 volt screw base is an E26. The 'E' indicates an Edison screw base and 26 is the diameter in millimeters.
Source: Wikipedia (footnote 3)