SAE AMS4081K PDF
This specification covers an aluminum alloy in the form of seamless, round tubing with wall thickness of 0.025 to 0.500 inch (0.64 to 12.70 mm) (see 8.6).
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Aluminum Alloy Tubing, Hydraulic, Seamless, Drawn, Round 1.0Mg – 0.60Si – 0.28Cu – 0.20Cr (6061-T4) Solution Heat Treated and Naturally Aged
SAE International , 08/30/2023