Historical
ISO 28741:2013
Road vehicles - Spark-plugs and their cylinder head housings - Basic characteristics and dimensions
ISO 28741:2013 specifies the main properties and dimensions of spark-plugs, including the terminals and the dimensions of their cylinder head housings, for use with spark-ignition engines.
ISO 28741:2013 does not cover screened and waterproof spark-plugs.
International Organization for Standardization [iso]