Anyone know sparkplug thread size? 12 mm or 14mm?

[Stang 19]

About to purchase a spark plug gap tool and I need to know if it is a 12 mm or 14 mm thread. Thx!

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[WildHorse]

You mean socket size? 16mm or 5/8th for the imperialists.

 

[Stang 19]

You mean socket size? 16mm or 5/8th for the imperialists.

Oops, sorry. Meant need thread size for our plugs on 18 and up GT.

 

[Dr. Norts]

Oops, sorry. Meant need thread size for our plugs on 18 and up GT.

First you have to tell us what you did lol. Did you cross thread a plug in the head?

 

[Stang 19]

First you have to tell us what you did lol. Did you cross thread a plug in the head?

I wish I had a more dramatic answer but I am actually looking to buy a spark plug gap adjusting tool and they list either at 12 mm or 14 mm thread size

 

[Dr. Norts]

Thread pitch is 14mm x 1.25.

 

[Stang 19]

Thread pitch is 14mm x 1.25.

Dr. Norts: thank you

 

[Slopoke]

He wants to use this type of gap tool

 

[Stang 19]

He wants to use this type of gap tool

True! There are also a couple of knock offs I found on Amazon .

 

[Cory S]

Been using this combo to measure and gap plugs for the last 30 years. Takes like 30 seconds per plug.

 

[GregO]

He wants to use this type of gap tool

I have this exact tool. It's great quality. I have one problem with the design. The threads are coarse so with a very slight turn of the knurled knob results in a drastic gap change. This needs to be redesigned with fine threads to offer more control when adjusting plug gaps.

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