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This technique is one of the most effective methods in mechanical assembly. A bearing cooled in liquid nitrogen shrinks just enough to slide easily into a part that would normally be too tight. At –196°C, the extreme cold reduces the metal’s size by micrometers, turning an interference fit into a slip fit. Once it warms back up, it expands and locks firmly in place—often tighter than hydraulic pressing. Called cryogenic shrink-fit assembly, it avoids heating, surface damage, and internal stress

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