High Carbon
Is there a way to tell the difference between a carbon steel tap and a high speed tap by looking at it?
When you hold a high speed tap and a carbon steel tap side by side, they look identical. They are sometimes etched with different codes such as (U)NC and NC. I have several of the same size, but I don’t know which is carbon steel and which is high speed. Any help?
If you try a file (on the shank) of the tap you will find the carbon steel is harder than the high speed tap.
Just a light touch with the file should do the trick.
Trail Master San Mai III & SK-5 High Carbon
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