Are M10 Screws 10mm in Length or Diameter? Explained

Learn what M10 screw sizing means and why M10 refers to diameter, not length, for your metric screw needs.

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No, M10 screws are not 10mm. The 'M' in M10 stands for metric, and the number 10 refers to the diameter of the screw in millimeters. So, an M10 screw has a diameter of 10mm, but it doesn't denote the length, which varies.

FAQs & Answers

  1. What does M10 mean on a screw? M10 indicates a metric screw with a 10 millimeter diameter. The 'M' stands for metric, and the number represents the screw's outer thread diameter.
  2. Is the length of an M10 screw always 10mm? No, M10 refers only to the screw's diameter. The length of an M10 screw can vary depending on the particular application.
  3. How do I measure the size of an M10 screw? Measure the outer diameter of the screw threads to confirm it is 10mm across; the length is measured from the base of the head to the tip of the screw.

Watch More

For more insights on screw sizes and metric fasteners, check out our detailed guides on common screw types, how to measure screws correctly, and tips for selecting the right fasteners for your projects.

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