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Thread: What size wire to use for 4-40 threading die
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Old 07-22-2002 | 01:23 AM
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Vince
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Default What size wire to use for 4-40 threading die
The Nickle alloy rod is ERNiCu-7

The mild steel rod is ER70S-2

I have used the mild steel rods in short applications with no problem, but if the length is more than about six inches they tend to fracture at the end of the thread. Now I use only the nickle alloy rods.

Vince
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