I just messed up a hex screw on my 190 e 2.3 1987 mercedes. While changing the rear rotors on my 190 e 2.3 in ran into a problem just a i was re assembeling the the wheel hub unit. While tightening up the hex screw with my allen wrench i ended up stripping the heard of the screw, now the allen wrench tool just spins when i apply pressure to tighten the rotor to the hub. Is there a way that i can get the screw out so that i can replace it with a new screw. What tools do i need to take take out the striped hex screw?
Also will comprimise my driving safety if that screw is not screwed in tight on the rotor.

when you bolt on the wheel, where is the rotor going to go? it'll be ok 'till you fix it. get a new bolt and a drill bit that'll fit inside the hex. drill away on the old 1. the head will come off and the remainder is only finger tight. if you leave the bolt out, there will be a new clunk in the rear. the rotor will move back and forth between the hub and wheel as you go reverse to drive. good luck, chuck.

Just had this same problem on my 533i when I was doing the front rotors. I took a drill and a hardened bit and trilled the head of the bolt off until the rotor fell of and landed on my foot This left enough of the bolt that I could use channel locks to get the rest of the bolt off and replace it. I would assume that the 190e would use the same set up as my BMW. If you do try this make sure you are very careful not to drill into the hib and drill out the threads.
Why would the rotor make a clunck? The hex head bolt just hold the rotor slightly on and keeps it in place. The actual rotor is kept on by the rim and the bolts that hold the rim on. Correct me if I am wrong.

on a bmw, you are right and i thought that was true for all cars until a certain sl with a clunk in the left rear when changing direction. the wheel and hub would move, but the screw was missing for the rotor and it didn't move with the hub. install screw and clunk was gone. that was 10 years ago and i still locktite those things in bmws, mbs and volvos. and so it goes, chuck.

I was wondering if there was a tool that i can buy to take out the stripped hex bolt, remember the top of the bolt is stripped out in the middle.

see above post-reference drill bit. good luck, chuck.

These work.
http://www.aldn.com/drillout.html

Though, in this case you could probably grind a slot in the head with a Dremel, and use a flat head screwdriver.

It won't matter at all until you next rotor change.

The torque value on those are very low. They do not do anything once the wheel in bolted on.

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1986 300E 5-Speed 240k mi.