Tips for Reading Metric Bolts

Metric bolts are used in many different products, accessories, and even automobiles, depending on where they were built. Many people who work on vehicles deal with metric bolts on a frequent basis and can read them very easily. If you are new to metric bolt, or are constantly stymied by the different numbers associated with them, here are some tips to help you read them for replacing or finding the right wrench or socket to fit.

Three Numbers for Reading

Metric bolts have three numbers that are associated with them. When reading the metric bolts, you will need to know what these three numbers mean for an accurate reading.

  • Shaft Diameter - The first number associated with metric bolts is the one that is for the actual diameter of the bolt. This number will be measured in millimeters or centimeters.
  • Thread Size - The next number is associated with the space in between the threads of the bolt. This is important for knowing how tight the bolt will be and the strength associated with it. This measurement is always in millimeters.
  • Bolt Length - This last number coincides with the overall length of the shaft of the bolt. This measurement will mostly be in millimeters.

A Typical Measurement

When looking for metric bolts you will see something like 2x1x25. This means that the head is two centimeters wide, with a thread measurement of 1 millimeter, and a length of 25 millimeters.