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Originally Posted by Matt Adams
Use part number 98535A125 from McMaster. ($1.50)
It's a high carbon steel with a tensile strength of 95,000 PSI. That'll boost your factor of safety above 3.
No worries.
Matt
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I was sure steels were commonly over 70k psi, I should have pointed that out.
Sanddrag, with a good steel key like Matt pointed out, you will have a safety factor of over 4 or 5. You should be fine.