What Is the Difference Between M10 and 10mm? Key Fastener Size Explained

Learn the difference between M10 metric fasteners and 10mm measurements. Understand when to use each term in bolts and dimensions.

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The term M10 refers to a metric fastener with a nominal thread diameter of 10 millimeters. The term 10mm can describe anything that is 10 millimeters in size. So, while M10 is specifically a type of bolt, 10mm can refer to any object or dimension measuring 10 millimeters.

FAQs & Answers

  1. What does M10 mean in bolts? M10 indicates a metric bolt with a nominal thread diameter of 10 millimeters.
  2. Is 10mm the same as M10? No. 10mm refers to any measurement of 10 millimeters, while M10 specifically refers to a bolt with a 10mm thread diameter.
  3. How do I know if I need an M10 bolt or a 10mm part? Use M10 when specifying a metric bolt size and 10mm when referring to any object or dimension measuring 10 millimeters.

Watch More

For more insights on metric fasteners and bolt sizes, explore our detailed guides on M8, M12, and other common bolt sizes. Understanding these differences helps ensure you select the right bolt for your project.

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