While doing a clutch job, I noticed one of my engine mount nuts was missing. There are two nuts on the bottom of each engine mount. I needed a 17mm hex wrench to tighten the remaining 3 nuts. While looking online for replacement nuts on majestic honda's website, they list those nuts as 12mm. I'm confused.

 

Hardware is sized by the size of the thread. 12mm.

 

Yup, majestic honda and other online parts list the thread size. The thread is 12mm while the head bolt is 17mm.

 

That's what I was thinking, but wasn't sure. Thanks guys.