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ASTM A519 4140 Alloy Steel Tubing is a high-strength chromium-molybdenum alloy steel tube manufactured to the ASTM A519 specification for mechanical and structural applications. Made from AISI 4140 alloy, this tubing combines excellent tensile strength, toughness, and fatigue resistance with good wear performance, making it ideal for demanding industrial environments.
4140 alloy steel tubing is widely used where durability and mechanical performance are critical. It offers reliable dimensional accuracy and can be supplied in round, square, or rectangular shapes with various finishing options. Commonly applied in automotive, machinery, and structural systems, ASTM A519 4140 tubing is suitable for shafts, axles, hydraulic components, heavy machinery parts, and pressure systems.














