One of many applications of extremely low temperatures is called \"cryogenic fit

Question

One of many applications of extremely low temperatures is called "cryogenic fittings". For example, a bolt (of special material) used to attach the rotor of a helicopter to the hub assembly will be placed in liquid nitrogen before being inserted into the bolt opening. What is the advantage of this method? One of many applications of extremely low temperatures is called "cryogenic fittings". For example, a bolt (of special material) used to attach the rotor of a helicopter to the hub assembly will be placed in liquid nitrogen before being inserted into the bolt opening. What is the advantage of this method?

Explanation / Answer

most solid materials expand when their temperature increases. we use the method of cryogenic fittings so that once we have fitted the bolts at extremely low temperatures, they will expand and the fitting would be better at room temperature. now the bolts are almost impossible to loosen at temperatures of the surroundings of the helicopter blades. and we use extremely low temperature in cryogenic fittings so that the bolts function even when the helicopter has to go through extremely cold regions

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