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 - A Lifetime of David Brown Tractors - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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