A spark plug socket is a tool meant for screwing the plug (tighten or loosen). It comes in various sizes depending on the hex of the spark plug. Hex (hexagon) is the diameter of the central region of the spark plug. The socket serves the purpose of tightening or loosening the plug through that hex. The size varies with the type of application.

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What Size is a Spark Plug Socket?

As for what is the size of a spark plug socket, there is no standard universal size. People often mistake to consider the most common sizes i.e., 13/16″ and 5/8″ as the standard size spark plug socket. These sizes are generally used for cars, whereas a ¾” plug socket is a common one for lawnmowers. Hence, you can find frequently used formats, but they vary based on their application depending on the vehicle. 

How to Find the Spark Plug Socket Size?

Finding the right size of the spark plug socket is not a tricky task, but I often see people messing it up. You can use the following steps to find the size of the spark plug socket.

First of all, check your car manual to find out the type and model of the plug. This makes it easy to find the size of the socket.Check the spark plug itself for the size of the socket. If it is accessible then, you can use Vernier calipers to measure the hex size. I see people struggling with the Vernier calipers, too; it is okay. Just consult a mechanic nearby. He will guide you on what you have been doing wrong.

I come across questions like what size is a standard spark plug socket? Well, there is no standard size. The size of any spark plug socket depends on the size and type of the vehicle it is used in. Some are the usual size that people mistakenly took as the ‘standard size,’ and some are quite big.

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Spark Plug Socket Size Chart

Here is the chart of the most used spark plug socket size in mm and inches and including their applications.