Andymark Churros

[asid61]

6061 1/2" hex will not bend in drivetrain applications, as we had to substitute a few 7075 axles for 6061 during build and they held up through 2 competitions. This might have been due to to other drivetriain problems that stopped us from moving too much though.
6063 is considerably weaker than 6061, so I would be wary of using it. For prototyping, it might be fine, but it would be much safer to just purchase some 1/2" 7075 hex stock from Online Metals instead.

EDIT: This would be in our team's experience only.