Thread: Thread size/pitch question

Hey everyone. I was wondering if someone could tell me the thread size and pitch of the stud that holds the b13 subframe (Nissan calls it 54401-4B000 Suspension Cross Member) up. I broke a stud off (yes that sucks) but it's apparently a size that I don't have in my tap-n-die set. Seems almost like an M12x1.25 but it's hard to tell. Is that the case? Search function is still broken. Otherwise, I'm sure I'd find it here somewhere. Thanks.

I can't say I have that info, but if you broke a stud off, then take the stud and compare it to the wheel studs. They are M12x1.25 so you can use them to compare. Or use a wheel lug nut to see if it will thread onto the stud. There is going to be a way to confirm this... Take another nut off the subframe and try to thread it onto a wheel stud if you want to try that instead.

That's a good idea. You mean the wheel studs are M12x1.25, not M12x1.125. Ya I forgot about that.

Yes, sorry, I've edited my post to clarify.

Confirmed. FYI all of the main front suspension bolts are M12x1.25. DON’T break them! M12x1.25 is a very rare thread to find replacements for. You’ll find yourself in quite a pickle if you snapped a stud.

Hey SE-R, I've actually replaced one of the studs you're mentioning. I'll have to dig through my pictures to see exactly what I did but I did buy a set of wheel studs from the UK that were long and m12x1.25. I do remember the fact that it was an uncommon size, which is why I would suggest ebay.

Edit:

here are the pics I found:







dunno if that helps at all but that's what I did


and yes, the car was on it's side

Also, I can take a look and see if I can find the rest of the set, it was a set of 4 or 5 m12x1.25 studs so I'm pretty sure I have leftovers. LMK

Wow that would be great! I spent several hours looking online and I’m coming up empty handed. I even got a quote for custom made studs and the pricing was over $100 per stud! Tt’s nice to know someone has been in the same situation.

Judging from the pics, you welded an extra plate onto the chassis? I'd be very interested in hearing how you went about it. Initially I was going to hit the stud with a die and cut some new threads, and put on a "thread extender but I am thinking new studs are the way to go to ensure they are strong enough.

PM me and we can talk about it if that's ok with you.

I guess a long wheel stud could work, but some quality "all thread" rods should also get you where you want to be if needed... This can't be hard to come by.

The tricky thing is getting a structural stud that is a class 10.9 (roughly SAE Grade 8) that had threads long enough. Everything I’ve seen online has partial threads or the stud itself is too short unless you get it from China with a minimum order of like 5000 pieces. The stronger the stud the shorter it is. One thought I had was buying extended wheel studs and cutting the knurled end off to make a fully threaded body, but they are all too short unless you change the thread pitch. Wildmane, if you don’t have extra studs lying around I may opt to buy a stud with a more common thread since I’m doing my own tapping anyway. Even then, it is difficult to find the correct length but it’s more feasible.