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Yes you probably cross threaded it when you were trying to put it back into the caliper, they are made of aluminum for the most part and they strip very easily. The caliper should be steel but on a newer vehicle might be a lighter alloy. If it is only partially in but is sealing and no brake fluid is present I wouldn't worry too much about it. If the system is sealing then you have four options:
1. Forcefully screw the bleeder screw all the way down and hope you dont break it off in the caliper and it seals.
2. Buy a new bleeder screw and make sure it threads straight in.
3. Buy a new bleeder screw and a tap and die kit. Retap the hole in the caliper to the proper thread size (you are basically cleaning up the threads at this points, not making the whole any larger). Screw the new bleeder screw in.
4. Buy a tap and die kit and tap the hole out to a larger diameter and replace it with a larger diameter bleeder screw.
You can also buy a new caliper or helicoil the old one, but this would require drilling and tapping the old one anyhow.
Those bolts should be allen head bolts and NOT torx (star shaped). With a torx bit in that hole all u will do is mess up a torx bit and the flats for the allen wrenches to grab onto. Try using a 10 or 12 mm( cant remeber which it is) allen head wrench.
It is an odd size, I believe 9mm thread and Heli-coil makes a kit just for this job. I know because I have the kit at work! Try another Autozone or ask to speak to the manager and have him look it up, it does exist for sure. This is actually a pretty common problem. If you're still stuck tomorrow and I will dig up the part number and post it.