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Re: 6061 Vs 6063
6061-T6 yield is about 39 ksi, versus 31 ksi for 6063-T6. So those McMaster numbers are comparing apples to orange popsicles.
As far as machinability, I don't think the difference is incredibly large. However, 6063 is mostly common for more complex extruded shapes anyways, so you're less likely to be doing large amounts of machining on it in the first place.
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