This International Standard specifies the main characteristics of M14 × 1,25 spark-plugs with flat seating and a hexagon smaller than the seating diameter, and their cylinder head housings, for use with spark-ignition engines.
ISO 8470:2001 history
2006ISO 8470:2006 Road vehicles - M14 x 1,25 spark-plugs with flat seating and 16 mm hexagon and their cylinder head housings
2001ISO 8470:2001 Road vehicles - M14 x 1,25 spark-plugs with flat seating and 16 mm hexagon and their cylinder head housings
1993ISO 8470:1990/Amd 1:1993 Road vehicles; M14 1,25 spark-plugs with flat seating and 16 mm hexagon and their cylinder head housing; amendment 1
1990ISO 8470:1990 Road vehicles; M14 × 1,25 spark-plugs with flat seating and 16 mm hexagon and their cylinder head housing