6061 Aluminum Square Tube | 6063 Aluminum Square Tube | M&K ...
Both 6061 and 6063 aluminum are majorly composed of magnesium and silicon, but 6061 aluminum possesses a tensile strength of at least 290 MPa or 42,000 psi, where 6063 has a tensile strength of at least 140 MPa or 20,000 psi. 6061 Aluminum Square Tube Chemical Composition Silicon minimum 0.4%, maximum 0.8% by weight Iron no minimum, maximum 0.7%