Historical
ISO 2344:1998
Road vehicles - M14 x 1,25 spark-plugs with conical seating and their cylinder head housings
This International Standard specifies the main characteristics of M14 × 1,25 spark-plugs with conical seating with normal reach, long reach and extra long reach and their cylinder head housings, for use with spark-ignition engines.
International Organization for Standardization [iso]