A spark plug is used in an internal combustion engine for the purpose of ignition. A spark plug carries electrodes separated by an air gap across which the current from the ignition system discharges to form the spark for combustion. A spark plug is made up of a center electrode, an insulator located outside the center electrode, a housing located outside the insulator and an earth electrode. A spark discharge gap is formed between the other end of the ground electrode and the opposite leading end of the center electrode. Spark discharge occurs between the center electrode and the ground electrode. The insulator projects from the rear opening of the metal shell in the axial direction. A terminal metal fixture is inserted into the projecting part of the insulator and is connected to the center electrode via a conductive glass seal layer which is formed by a glass sealing procedure or a resistor. A high voltage is applied to the terminal metal fixture to cause a spark over the gap between the ground electrode and the center electrode. In a spark plug for use in an internal combustion engine, the accuracy in positioning a ground electrode and a center electrode is important.
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