*** DIY on how to re-thread and replace these screw are in post #12 ***

I wanted to replace my rotors today. Looks like the previous owner attempted this task but after completely destroying one of the rotor hub screws, he must have given up. One screw came out easily but the the second one was completely gone. I managed to drill out the head and drill through the entire screw. Does anyone one know what the thread size is I need to re-thread this?

Is it 1/4 in. x 20 NC like this one:


I never rethreaded anything in my life so this is a learning experience. Any help would be great.

Also, I would imagine that driving around with one of these tiny screws missing should not be a problem?

One more dumb question but these are the specs for replacement bolts, correct?

http://www.homedepot.com/p/Crown-Bol...-202102301-_-N

 

Pelican Parts has them for 75 cents a piece. They list them as 6x12 mm. Search part # 909-269-047-01-M100. You can drive around all you want without them. They are only there to hold the disc in place when you have the wheel off.

 

i bought these and work perfectly...

http://www.autozone.com/screws-pins-...nda/68840_0_0/

these screws are almost disposable. LOL

 

Thanks guys. So yeah, looks like any m6 x 12mm screw works. Now just need the rethread and replace all of them.

 

Buy yourself a small tin of rapid tap or similar product....make the job a whole lot easier.

 

^ Thanks! Never heard of that stuff before. Let me see if a local retailer has this.

 

Any jobber should have this

 

Apparently buying it in IL is not the easiest thing to do... anyways, amazon has something similar with good reviews. I might end up getting this or just use wd-40 since I don't plan on threading much in the near future:

 

WD40 should work, any oil really ,just so you aren't running a dry tap.

 

I wouldn't even bother, they are completely unnecessary.

 

you have to have a countersunk screw or it will hit the wheel when its installed and cause a major vibration. the only reason they are there is to keep the hub and rotor lined up to install lug bolts

 

*** Update for everyone in case someone will need to do this in the future ***

I just finished replacing the front rotors, pads, sensors, and re-threading 3 of the 4 rotor screws. Super simple process.

Since there is multiple DIY on how to replace the rotor and pads, I will just skip that part and walk through the re-threading process.

Parts needed:
- 6 mm - 1.00 Plug Tap with handle
- M6-1.0 x 12 mm screws (like posted above, about .35 each)
- 5 mm drill bit
- 6 mm drill bit
- WD40 oil (any oil will work)

1. Start with 6 mm bit and drill out whatever is left of the screw head till it falls off (lubricate with the wd40).
2. Do not continue drilling any deeper with the 6 mm bit.
3. Switch over to the 5 mm drill bit and drill through the screw shank(lubricate with the wd40). I always use Dewalt bit so this process takes about 1 minute. These are very soft screws.
4. Use the 6 mm Tap to slowly thread through the hole using a tap handle NOT power drill (lubricate with the wd40).
5. Take new screw and try to screw it in the newly re-threaded hole.

The above process should take about 5-7 minutes.

While doing the front rotors, I ended up drilling out and re-threading 3 of the 4 screws. Use Anti-Seize with the new screws so this won't be an issue next time rotors need to be removed.

 

Fwiw I always use anti seize on lug bolt threads, the cone faces, a smidge where the wheel contacts the hub too. I don't use much but enough I don't have stuff locking and seizing!