What size are they, i seem to have misplaced them. They go on the studs protruding from the engine.

Thanks!

~Erik

 

I believe they are 14mm. Its been awhile since working on it but I am pretty sure it is 14mm.

 

The size of the wrench that goes on the nuts is 14mm, but the actual threads arent. I dont know the exact size of the thread but I bet its 12mm, dont quote me on that.

 

See if this works: https://www.rx7club.com/2nd-gen-archive-72/master-list-thread-sizes-2nd-gen-nuts-bolts-367392/

 

the manifold to engine is m10 or m12x1.5. you wont be able to find the same nut size (14mm wrench) as that size is usually 17mm i think. try to find those smaller sized outer nuts for better clearance there.
mazda has em, i grabbed a couple from my work (nissan/infiniti), most local parts stores w/ nuts/bolts DID NOT have the smaller external sized ones.

 

the manifold to engine is m10 or m12x1.5. you wont be able to find the same nut size (14mm wrench) as that size is usually 17mm i think. try to find those smaller sized outer nuts for better clearance there.
mazda has em, i grabbed a couple from my work (nissan/infiniti), most local parts stores w/ nuts/bolts DID NOT have the smaller external sized ones.

 

I actually got new studs and same exact nuts from a hardware store. The studs and bolts were identical to the OEM mazda ones. At our Lowe's over here we got a big selection of nuts and bolts, a lot of both standard and metric.

 

lol, funny thread, I just bought some nuts for the downpipe studs and they where 10x1.50 and the external size was 17mm, you are right. I don't think he should have any clearance issues with that but if you think you will I'd go to the deal or mazda trix or like someone said earlier try home depo for smaller outer dimension nuts.

 

Stock nut size is 14mm.
Thread size is 10mm x 1.5.


-Ted

 

thank you!

 

Sorry I did not know he wanted the thread size. Oh well. If you need some new nuts you could also tyr like RotaryWorks or someplace who usually sells a a lot of Jspecs and stuff. I know Shane has sold like complete bolt kits from engines he tore down and did not rebuild. Otherwise you can try Mazda.