The mixture of SAE and metric fasteners can be a real head ache. First you have to determine which is meant to be used on the fastener then you have to hope you have that wrench or socket. Many of the sizes are actually interchangeable… or close enough to work in many instances. Below is a conversion chart that may help you out. So the next time you can’t find a 15mm you will know that you can probably use a 19/32. (Its the one that looks brand new, almost like its never been used before.)

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