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Spark Plug Terminal Types

Spark Plug Terminal Location

The top of a spark plug contains a terminal, which serves as a connector to the ignition system. 

There are 2 connection types available. Some applications utilize a boot that connects directly to the threaded terminal stud. However, most vehicles use a boot with a larger connector inside, made to snap onto a terminal nut.

There are 3 spark plug terminal configurations available: solid, threaded stud and removable.


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Removable Terminal Nut


Spark plugs used for both terminal nut and threaded stud connection types may come with a removable terminal nut. In this case the plug is manufactured with a threaded terminal stud, then a screw-on terminal nut is added to the plug or package. This allows the plug to be used with either connection type.



Solid Terminal


Plugs with a solid terminal nut can only be used with the larger, snap-on connector type. The terminal is part of the plugs design and cannot be removed. Most automobiles utilize this type of connection system.

In cases of high vibration, a removable terminal nut may become loose and create an insecure electrical connection. Therefore if a terminal nut is used on marine, ATV, or similar applications, a plug featuring a solid terminal is preferable, if available.

Threaded Terminal Stud


Plugs with a threaded terminal stud can only be used with plug caps or wires designed to snap over the smaller threaded stud, though terminal nuts can be purchased separately and added to the plug.

The use of terminal studs as a connection type is most common in motorcycle and power sports applications.