Spark Plug Wrench Size
Almost each and every spark plug comes in different hex size.

Spark plug wrench size. These are 13 16 inches or 21 mm sockets and 5 8 inch or 16mm sockets. If the recommended toque is in inch pounds and you need to convert it to foot pounds all you need to do is divide the inch pounds by 12. If you re a tuner or engine builder in search of the perfect spark plug for your current project pay special attention to the hex size required. A plugs hex size determines the socket required for installation.
Hex refers to the socket or the diameter in the center of a spark plug which is used to turn the spark plug and screw it down or undo it. So if you re working with a spark plug recommendation of 6 foot pounds it converts to 72 inch pounds. There are a lot of options out there but in general you need 14 16 18 21 mm sockets with both 12 and 6 point configuration. W indicates a 14 mm x 1 25 pitch size x indicates a 12 mm x 1 25 size and u indicates a 10 mm x 1 0 size.
There are three size spark plug threads currently being used in motorcycles and atvs. 3 8 thin wall spark plug socket 12 point removal tool sets with 3 8 adjustable t wrench drive torque spark plug spanner extension kit 25cm wrench spark plugs. Sockets of 18mm size are also available even though they are not as common as the other two spark plug sockets. The size of the socket to be used is determined by the hex of the spark plug.




























