What is the Size of an M4 Screw in Millimeters?

Learn the exact dimensions of an M4 screw, including its 4 mm diameter and 0.7 mm standard pitch for coarse threads.

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An M4 size corresponds to a metric thread of 4 millimeters in diameter. Specifically, the detailed size for M4 screws includes a major diameter of 4 mm and a standard pitch of 0.7 mm for coarse threads.

FAQs & Answers

  1. What does M4 mean in screw sizing? M4 refers to a metric screw with a nominal outer diameter of 4 millimeters.
  2. What is the thread pitch of an M4 screw? The standard pitch for an M4 screw is 0.7 millimeters for coarse threads.
  3. Are M4 screws commonly used in construction or electronics? M4 screws are widely used in both mechanical assemblies, electronics, and light construction due to their moderate size.
  4. How do I measure the size of an M4 screw? You measure an M4 screw by its major diameter, which is 4 millimeters, typically using a caliper.

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For more detailed information on metric screw sizes and threading specifications, check out our related guides on M3 and M5 screw dimensions and their common applications. Understanding thread sizes can help ensure you select the right fastener for your project.

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