What is the meaning of ngk spark plug model

The first letter of Ngk's spark plug model represents the diameter of the spark plug screw, such as b for a 14mm thread, c for a 10mm thread, d for a 12mm thread, etc. You can know the spark plug by the first letter Diameter size.

　　

The spark plug ignites gasoline by emitting sparks. If the engine burns electric sparks, the ignition mixer cooperates with the ignition system and fuel supply system of the automobile engine to make the engine do work. To a large extent, the spark plug determines the performance of the engine. According to the calorific value, it can be divided into cold spark plugs and hot spark plugs. According to the electrode material, it can be divided into silver alloy spark plugs and platinum alloy spark plugs, etc. The spark plug types can also be divided into quasi-type spark plugs, electrode spark plugs, and pole-type spark plugs. The most commonly used type is the quasi-type spark plug, and the replacement cycle of the spark plug is about 60,000 kilometers.