HI,

Does anyone know what size thread the bolt is that secures the front seat belts to the floor underneath the front seats?

It looks like an M11 but I am unsure of the pitch. It looked like a 1mm pitch, but I purchased 1mm and 1.25mm pitch taps to be safe and it still doesn't look right when compared to the bolt.

I need to clean the thread up in the floor as its full of debris.

 

Not sure on cars overseas, but US cars seem to be a weird size. I've never measured it, but I was thinking it might be a standard inch-size of some kind for US DOT.

Try a non-metric thread gauge and see what it comes up with.

Dale

 

7/16 UNF is the international standard for the last 30 odd years - and the FD is no exception.

 

I took one out last night. It's a fine thread 15mm.
I thought it was 17mm but was surprised when it was the 15mm.

 

Guys, thank you all for your help