What size socket do i need for a spark plug?

What size socket do i need for a spark plug?


When it comes to changing spark plugs in your vehicle, one of the essential tools you’ll need is a socket. But what size socket do you need for a spark plug? In this article, we will dive into the details and provide you with the information you need to select the correct socket size for your spark plugs.

Socket Sizes for Spark Plugs

The most common socket size used for spark plugs is 5/8 inches or 16mm. This size fits the majority of spark plugs used in cars, motorcycles, and other small engines. However, it’s important to note that not all spark plugs have the same size, and there are exceptions to this general rule.

Other Socket Sizes

While 5/8 inches or 16mm is the most common socket size, there are instances where different socket sizes may be required. Some spark plugs, particularly those used in larger engines or specific vehicle models, may require a different socket size. It’s crucial to consult your vehicle’s owner’s manual or a reliable source to determine the correct socket size for your specific spark plugs.

How to Determine the Socket Size

If you’re unsure about the socket size required for your spark plugs, there are a few methods you can use to determine the correct size:

Consult the owner’s manual: The owner’s manual for your vehicle will often provide information on the correct socket size for spark plug replacement. This is the most reliable source of information and should be your first point of reference.

Check the spark plug packaging: Spark plugs are typically sold in packages that indicate the socket size required for installation. Look for this information on the packaging to ensure you have the correct socket size.

Use a spark plug socket set: If you frequently work on vehicles or small engines, investing in a spark plug socket set can be beneficial. These sets usually include a variety of socket sizes to accommodate different spark plug types.


Selecting the correct socket size for your spark plugs is crucial to ensure a proper and secure installation. While the most common socket size is 5/8 inches or 16mm, it’s important to consult the owner’s manual or reliable sources to determine the specific socket size required for your vehicle’s spark plugs. By using the appropriate socket size, you can confidently perform spark plug replacements and maintain the optimal performance of your engine.


– www.cars.com
– www.sparkplugs.com
– www.autozone.com