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What do the letters on a spark plug mean?

1 Answers

LeTimothy

07/24/25 4:31am

The meanings of the letters on a spark plug are: 1. The first letter represents the spark plug thread diameter; 2. The second letter represents the spark plug type; 3. The third letter represents the spark plug structural type; 4. The fourth letter represents the electrode; 5. The fifth digit represents the spark plug heat value; 6. The sixth letter represents the spark plug thread length; 7. The following number represents the spark gap. Different brands of spark plugs have different models, and different spark plug models have different sizes. When replacing spark plugs, it is necessary to choose the model suitable for your car's engine, and the size must be appropriate. Selecting the right size is crucial. If the size is incorrect, even if it can be installed, it will affect performance.

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