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Re: 6061 Vs 6063
Modulus, as with most aluminum alloys, is approximately the same. However, quoting Mcmaster, 6061 T6 has approximately 4 times higher yield strength- ~40,000 psi vs 16,000 psi for 6063. So depending on the application, a switch may or may not make a difference. If you need stiffness, it won't really make a difference. If it's yield you're after, such as in a threaded rod, pick the 6061.
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