# How to measure a Bolt or Axle

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This is an article from the TBolt USA Tech Database, the store's free online library of pit bike technical info. The text below is the article as written.

## Article

Industry standard practice is to measure the shaft of the bolt NOT the HEAD

All of the Bolts and Axles we offer are measured this way

One easy way if to put the open end of a wrench on the shaft
a 15mm open end wrench will fit a 15mm axle shaft

![image](https://tboltusa.com/store/images/BOLT-EXAMPLE.png)

## Tech Database sections

- [Tech Database home](https://tboltusa.com/store/tbolt-usa-pit-bike-minimoto-technical-info-database-tech-15.md)
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- [How Things Work](https://tboltusa.com/store/how-things-work-tech-115.md)
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- [Pit Bike Installation Info](https://tboltusa.com/store/pit-bike-installation-info-tech-99.md)