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You can over-torque a bolt and you may not know it. But you can damage the bolt in several ways that may be visible.
1. The threads will be stripped or sheared away.
2. The bolt will be permanently stretched so it is longer than it originally was.
3. The head of the bolt may be twisted or the corners of the bolt head rounded off.
High strength bolts are marked on the head with symbols that indicate the strength of the bolt. You should know what type bolt you are using and its application. Just because it is made of Steel, that does not mean it will have sufficient strength for some applications.
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