Nope, the hanger is the bit designed to fail. Granted, if you nail something enough, those screws will fail as well. Most replacement hangers come with whatever bolts are needed for that reason.

http://wheelsmfg.com/content/view/633/27/

http://derailleurhanger.com/specialized.htm



Those two make/sell many hangers, to fit many bikes. I've used some from both,, and they are just fine. IMO, made to better quality than many stock hangers.