Socket cap

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S Point

Base types

Do you know anything about "E", such as in E11 or E26, which relates to the base? It is named after the inventor, Thomas Edison's "Edison screw". The name has been used since General Electric (GE) has made it popular.
Other initial letters will be written in the following specifications.

"BA"：Insert type for automobiles
"G"：Type with two or more terminals
"P"：Fixed focus type
"R"：A type with a depression at the contact point

So what does the next number represent? It is easy to remember the number as an approximate value of the connector dimensions. For example, the numbers on the base notation “E26” such as for average bulbs used in homes for lights and fluorescent stands means that the base diameter is 26 mm. If the terminal type is "G6.35", there is 6.35 mm between the pins of the plug-in.

Screw type