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The Essential Socket to Bolt Size Chart

The Essential Socket to Bolt Size Chart

When it comes to working with sockets and bolts, having the right size is crucial. Using the wrong size can lead to stripped bolts, damaged sockets, and even accidents. To help you avoid these issues, we have put together an essential table that will guide you in matching socket and bolt sizes accurately.

Why is matching socket and bolt sizes important?

Matching socket and bolt sizes is important for several reasons. First and foremost, it ensures a secure and tight fit, which is essential for the proper functioning of the bolted joint. Using the correct size socket prevents slippage and minimizes the risk of damaging the bolt head or the socket itself. Additionally, using the right size socket and bolt combination allows for efficient and effective torque application, ensuring that the bolt is tightened to the required specifications.

Understanding socket and bolt sizing

Socket and bolt sizes are typically measured in both metric and imperial units. Metric sizes are expressed in millimeters (mm), while imperial sizes are expressed in inches. It is important to note that socket and bolt sizes are not interchangeable between metric and imperial systems. Therefore, it is crucial to use the appropriate sizing system for your specific application.

The essential table for matching socket and bolt sizes

Below is a comprehensive table that provides the recommended socket size for each bolt size, both in metric and imperial units:

M Size Thread Pitch (mm) Socket/Wrench Size (mm) Bolt Length (mm)
M2 0.4 4 3 to 20
M2.5 0.45 5 3 to 25
M3 0.5 5.5 4 to 30
M4 0.7 7 5 to 40
M5 0.8 8 6 to 50
M6 1.0 10 8 to 60
M8 1.25 13 10 to 80
M10 1.5 17 12 to 100
M12 1.75 19 14 to 120
M16 2.0 24 20 to 160
M20 2.5 30 25 to 200
M24 3.0 36 30 to 240
M30 3.5 46 40 to 300
M36 4.0 55 45 to 360

Using the table

To use the table effectively, simply identify the bolt size you are working with, and refer to the corresponding socket size in the same row. For example, if you have an M10 bolt, you would use a 17 mm socket in the metric system.

It is important to note that this table provides general recommendations and may not cover all possible socket and bolt size combinations. In some cases, specialized bolts or sockets may require different sizes. Always refer to the manufacturer's recommendations or consult a professional if you are unsure.


Matching socket and bolt sizes is essential for safe and effective fastening. By using the right size socket, you can ensure a secure fit, prevent damage, and achieve the desired torque. Refer to the provided table as a starting point, and always double-check the manufacturer's recommendations for specific applications. With the right tools and knowledge, you can confidently tackle any project that involves sockets and bolts.

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