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A bolt, fundamentally, is a threaded fastener designed to secure objects together. When it comes to fixing or replacing them, the first step is always identification. Different types of bolts, such as hex bolts, carriage bolts, or machine screws, require different approaches. For instance, a hex bolt typically needs a wrench or socket to tighten or loosen, while a carriage bolt has a square neck under the head that grips the material it's inserted into.

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m8 1.25 threaded rod