Key Set Metric

Key Set Metric

What are the difference between Imperial and Metric Allen keys?

One difference is the units (mm/inches).
Are there any difference in the structures of these key eg:

can I find these exact key's in an Allen Key metric set?

1/4” Allen Wrench
1/8” Allen Wrench
5/64” Allen Wrench
.050” Allen Wrench
3/16” Allen Wrench

Thank you.

The only difference is the units, but this has a secondary effect that you may not be counting on: rounding.

People make wrenches in nice numbers. So, an imperial set will be measured in inches and have a 1/4" and 1/8" and so on. A metric set will be measured in millimeters, and will be 3mm, 4mm, 5mm, etc.

You won't find those exact keys in a metric set. 1/8 inch would be 3.175mm, so you might be able to get away with the 3mm key, but it would be a little loose in a 1/8 inch socket.

Buy yourself a metric set and an imperial set. If the bolts seem to be in-between sizes (this size is too loose, and the next size up is too big), switch to the other set.

Metric - Stadium Love

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