How to Read NGK Spark Plug Model Numbers?

1 Answers
DeHope
07/25/25 4:05am
The model number of a spark plug is generally arranged in the order of "material", "size", "heat range", "insulation characteristics", "resistance", "electrode shape", and "gap". Taking DENSO's IW16EXRU11 as an example, here is a detailed breakdown: 1. I: Represents the material is iridium, W: Indicates the spark plug diameter is 14mm, 16: Heat range is level 3; 2. E: Represents the thread length is 19-20mm, X: Insulation characteristic is super insulation material, R: Has resistance, U: Ignition electrode structure features a U-shaped groove, 11: Spark plug gap is 11mm.
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