Spark plug has central and earth electrodes and isolation with a glazing layer on the surface and an intermediate body section

摘要

A spark plug comprises central and earth electrodes, an intermediate body section and isolation (200) comprises a glazing on a rear body section (245), a shoulder (240) and an intermediate section of an insulator that is fused and flows into a groove (235) between the shoulder and a maximum diameter section (210) but does not reach this section.