Well, I am about to drop my engine in, and I did a manual swap on the car and I am trying to bolt the pressure plate to the flywheel. my question is, what size and tread are the bolts that go into the flywheel, I tried some I had laying around and they start but are clearly not the right thread. Please let me know, and no I couldnt have saved them, I had and auto before. Thanks

 

I would not use anything but OEM bolts for that.

Dave

 

Well...they really don't torque all that tight. I just check the FSM and it said 14 to 19 ft./lbs. One would think a good grade 8 bolt would be perfectly fine, wouldn't it?

 

Grade 8 is only a designation for imperial fasteners.

In metric you want Class 10.9. My bigger concern would be if I don't know the exact length of bolt, that there would not be enough thread engagement or too much and the bolt bottoms out without clamping down.

Dave

 

I just want to know the thread type since, it appears to be fine thread and I grabbed a random bolt that will start, but wont thread in, does anyone know the length and thread pitch?

 

where do you guys get oem nuts and bolts?

 

The pitch is .1

 

Ordering them from your local mazda is probably the easiest way.

 

Ray Crowe of Malloy Mazda

or

Mazdacomp if you compete at all with your car.

 

M8x1.0, 16mm long if I remember correctly. Make sure to get 8.8 or 10.9 (preferably 10.9) grade bolts or you'll be pulling that tranny back off before you know it.