55, although it may seem counterintuitive, heating the bolt rather than the surrounding material works. The thing to remember is you're trying to disturb the bond between the threads in the fastener and the threads in the hole. Moving either one will break that bond. It is MUCH easier to get the fastener hot enough to expand than it is to get the surrounding material to expand. Not only is there much less material to heat, the thread corrosion serves as a insulator to concentrate the heat in the fastener.
This method works particularly well with aluminum castings. Try to heat an aluminum casting hot enough to release a steel fastener, and you're likely to blow a hole through the casting. On the other hand, you can apply a lot of heat to the fastener without worrying about the aluminum.
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Today's Featured Article - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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