Is an M5 Screw Really 5mm in Diameter? Understanding Metric Thread Sizes

Discover the truth about M5 screws and their dimensions in this informative video.

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No, an M5 screw is not 5mm in diameter. The 'M' in M5 denotes the metric thread size, and the number indicates the nominal outer diameter of the thread, which is actually 5mm. However, the screw itself includes the thread and core size, making the core diameter slightly less than 5mm.

FAQs & Answers

  1. What does M5 mean in screws? M5 indicates a metric screw with a nominal outer diameter of 5mm for the thread size.
  2. How do I measure screw diameter? You can measure screw diameter using calipers or a screw gauge, ensuring to account for threading.
  3. Are M5 screws interchangeable with other sizes? M5 screws can only be used with M5-sized nuts or threaded holes, and sizes should not be mixed.
  4. What are common applications for M5 screws? M5 screws are commonly used in furniture assembly, electronics, and automotive applications.

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