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