This standard will be an updated version of SAEJ548/1. It is intended to specify the design requirements and dimensions for spark plugs and their cylinder head mounting. This standard will cover automotive, light duty non-automotive and small engine spark plugs. It does not include aircraft and large industrial engine type spark plugs..
The stabilized SAE J548/1 is an important document historically which is applicable to a large number of engine applications still in use. However, the SAE J548/1 is significantly out of data with current practice for modern and future trend engines. To preserve the important historical information included in SAE J548/1 our committee wishes to create a new document using the number J548/3.