| Part Name | Description |
|---|---|
| Terminal | Receives high voltage from the ignition coil and transfers it to the spark plug |
| Insulator | Made of ceramic; prevents electrical leakage and withstands high voltage |
| Center Electrode | Conducts electricity to create the spark |
| Ground Electrode | Works with the center electrode to form a spark gap |
| Spark Gap | The space between electrodes where the spark is generated |
| Metal Shell | Outer metal body that fits into the engine and helps dissipate heat |
| Thread | Allows the spark plug to be screwed into the cylinder head |
| Gasket / Seal | Prevents gas leakage and ensures proper sealing |
| Resistor | Reduces electrical noise and interference with electronic systems |
| Core Nose | Controls heat range and helps prevent fouling |