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The “M” in M8 indicates that this is a metric thread size, specifically with a nominal diameter of 8 millimeters. The designation “fine” refers to the thread pitch, which is the distance between threads. In the case of M8 fine thread nuts, this pitch is typically 1.25 millimeters, which is finer compared to the standard pitch of 1.0 millimeters for M8 coarse threads. Fine threads offer advantages in specific applications, as they create a tighter connection and are less prone to loosening under vibration.