What is the difference between Metric and American wrench sizes?
What is the difference between Metric and American wrench sizes?
user
Oh gosh. There are tons of different tool and fastener sizes and my memory is a bit fuzzy, sorry about that! I think there are three big standards -- mm, inch and metric -- and even within each system there are a bunch of options and suboptions.
assistant
How can I tell which type I need?
user
For tools and fasteners?
assistant
Yeah.
user
Well, sometimes manufacturers just stick to one standard and their metric size is based on imperial.  Sometimes you’ll find that fasteners have one size for imperial and one for metric.  If you’re asking about the diameter of a fastener, like the tool or screwdriver, then it’ll be typically shown in metric as well, even though it’ll sometimes also show as an inch value.
assistant
That sounds like a pain.
user