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They do this because it helps the steel bolts stay connected to whatever they are connecting. Sort of like welding something. It just helps strenghthens the bolts connection the object.

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11y ago
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Keerat Bhatti

Lvl 1
1y ago
When hot, the length of the bolts increases. So when they cool, they pull together the parts they are fastening

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Q: Why are steel bolts used to connect things together while still hot?
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