The invention relates to a
spark plug (1) with a longitudinal axis X, having: • a housing (2) having a longitudinal bore, as a result of which the housing (2) has an outer side (20) and an interior (21), and having a thread (22) formed on its outer side (20), as a result of which a threaded region (220) is formed on the outer side (20) of the housing (2), and having a thread-free region (230) which adjoins the threaded region (220) on the
combustion chamber side, and also has a
combustion-chamber-side end face (25), • an insulator (3), the
combustion-chamber-side end of which is inside the housing (2), • a central
electrode (4), which protrudes from the insulator on the
combustion chamber side and the combustion-chamber-side end of which is inside the housing, • at least one ground
electrode (5), in particular two or more ground electrodes, which is arranged in a lateral through-bore in the housing, • a radial ignition gap (45), which is formed by the ground
electrode (5) and the central electrode (4) and which is formed inside the housing (2), wherein a plane A can be spanned by the combustion-chamber-side end of the ignition gap (45) perpendicular to the longitudinal axis X, characterised in that the through-bore for the ground electrode (5) is formed on the thread-free region (230) of the housing (2), and in that the thread-free region (230) has further openings (24) which are designed such that a gas flows out of the
combustion chamber through the openings (24) into the housing interior (21).