Hi 1fast guy!
Everything that both responders mentioned are good, ASSUMING you're talking about a "6061"-T6 BM is being used... My point here is, you only gave out a Temper designation, and NOT a specific grade of Aluminum which the Temper condition designation could be from a number of Aluminum grades so just for clarification purposes, what grade are we talking about here 1fastguy???
Respectfully
Henry