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Quite often there is some question as to whether alloy 6063-T6 or 6061-T6 should be the preferred alloy for grating products. The design of aluminum grating for pedestrian loads is deflection limited, rather than strength limited. Although alloy 6061-T6 is stronger than alloy 6063-T6, the Modulus of Elasticity for both alloys is the same: 10,000,000 psi. As a result, equal loads will produce the same deflection, provided, of course that the yield strength is not exceeded.
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