Historical
ISO 6550-4:2005
Road vehicles - Sheath-type glow-plugs with conical seating and their cylinder head housing - Part 4: M8 x 1 glow-plugs
ISO 6550-4:2005 specifies the main characteristics of M8 x 1 sheath-type glow-plugs with conical seating and their housing in the cylinder head, for use with diesel (compression-ignition) engines.
International Organization for Standardization [iso]