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How to Identify DENSO Spark Plugs
The tables below explain how to read our Iridium, as well as our standard plugs.
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Iridium Power Plug |
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Thread Size and Hex Size |
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Heat Range |
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Thread Reach |
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Special Design |
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Internal Construction |
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Special Gap Configuration |
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Gap |
*The thread reach for these letters are 19.0mm. **Special heat range. ***When the first suffix is J or QJ.
Back to Heat Ranges
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