E-3SparkPlugs.com is part of the SparkPlugs.com family, an authorized full line E3 dealer.  To contact E3, click here.

Filters

ISO vs. JIS Spark Plug Heights

ISO (International Standards Organization) is an international organization which establishes standards for the production of automobiles and their parts. The ISO height for a spark plug from the seat to the top of the terminal nut is 50.5mm (1.98").

JIS (Japanese Industrial Standards) is a Japanese organization which establishes standards for the production of Japanese automobiles and their parts. The JIS height for a spark plug from the seat to the top of the terminal nut is 53mm (2.086").

ISO Plug HeightJIS Plug Height