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 - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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