I actually remember this one being an oddly light amount of force and then snapping off. Not sure if it was some sort of anomalous fatigue on the bolt, or it had been abused prior to my ownership. I do remember the threads were less than smooth when extracting and reinstalling the new bolt (I think this was the job that gave me an excuse to buy a good tap and die, if IIRC).
Long story short, there was something else going on there on my particular rig, so as long as yours is torqued and maintained properly, you should be A-OK.