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Bolt Size


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I was hoping to find out the size conversion for bolts and nuts that our quoted at size 'M??' into mm. I know that my impact wrench can take bolt sizes M5 to M16 but I want to know what size these bolts our in 'mm'.


Hope somebody can help.





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The M# actually refers to the diameter of the shank of the bolt but a quick google of Metric bolt head throws up this

As it shows there are a number of different standards to the Hex bolt head size but they are in fact quite similar.




EDIT: damn beat me to it...

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