what is size m12

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The term "M12" typically refers to a metric thread size, commonly used for bolts, screws, and other fasteners. In the context of fasteners, "M12" specifically denotes the size of the thread diameter. Here's what it means:

The "M" stands for metric.
The "12" represents the nominal diameter of the thread in millimeters.

So, an M12 fastener has a thread diameter of 12 millimeters. It's important to note that M12 is just one of many metric thread sizes available, and the size of a fastener can vary in terms of length, material, and other characteristics.