#### Thread man

##### Well-Known Member

With this formula you should be able to find the best wire diameter for any thread - as long as you know the pitch and thread flank angle.

Depending on the thread lead angle there will be a small difference re "exact" but, if making a thread, the formula above is more than accurate enough.

**A quarter the pitch divided by the cosine of half the flank angle.**Depending on the thread lead angle there will be a small difference re "exact" but, if making a thread, the formula above is more than accurate enough.

*For those that have already looked and perhaps written it then I made a mistake. First time I wrote "Half the pitch".*
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