One of my rotor retension screws decided to strip out and then the head popped off leaving the threaded part stuck in the hub. Turns out the ones on the car were stainless

So I went to the only store in town that stocks Metric fasteners in any variety. They do not carry any sort of Phillips head screw in anything but stainless. They did carry a flat head screw in Grade 12.9 with a hex socket in the top. Am I asking for trouble by using these? Will the heavy duty metal strip the hub threads?

WTF are the factory screws made of... alloy or something?

 

Probably not going to be much help at this point, but I always use a bit of anti-seize on these screws and never have any trouble getting them out with just a regular phillips screwdriver. The anti-seize should alleviate any issues using stainless as well. These screws are just there to keep things from rattling around, they don't provide any serious support to anything, so you don't have to hammer them on, just get them nice and snug.

 

Yeah... never had any issues before. New ones definitely will get a liberal coat of anti-sieze.

Just wondered if the factory used a special part that I need to order instead of using what is locally available.

 

I was able to find generic replacements at Home Depot. Honestly you dont even really need to replace them. The rotor is sandwiched inbetween the hub and wheel anyhow. But as Kevin mentioned, liberal use of anti-seize and ive never had problems removing them. For the first timers, an impact driver has always worked for me.

 

Sounds like I just got unlucky this time. After 3 years I must have done this 2 dozen times now and it is the first issue I've had.

 

I was doing a brake job on my 2000 Honda Odyssey minivan at the same time as the Porsche and noticed that the brake retension screws were almost identical. The Honda screws had slightly smaller heads, but still adequate to retain the rotor. If you have a Honda dealer nearby you might inquire. They are even gold in color.

 

I like having these screws in place. They can prevent rust/dirt from falling in between the rotor & hub when removing the wheels. This prevents run-out & brake pulsation.