4140 Alloy Steel Round Bar – 1.5" Diameter x 36" Length, Cold Finished, Annealed, Unpolished Mill Finish, ASTM A108 – High Strength Chromoly Steel Rod for Industrial Applications

The LAJIAOZ 4140 Alloy Steel Round Bar is a high-performance industrial-grade steel rod crafted from premium 4140 Chromoly steel. Measuring 1.5 inches in diameter and 36 inches in length, this round bar features a cold finished surface for improved dimensional precision and an annealed core for superior ductility and machinability. Engineered for high-stress, heavy-duty environments, 4140 steel offers outstanding strength, impact resistance, abrasion resistance, and fatigue durability. This makes it a popular choice for a wide range of mechanical parts including gears, shafts, spindles, valves, sprockets, and collars. Suitable for machining, welding (with post-weld heat treatment if hardened), and heat treatment, this steel bar is an essential material for professionals in aerospace, automotive, oil & gas, defense, and agricultural industries. Whether you're fabricating custom components or replacing critical parts, this alloy steel round bar delivers reliable performance that meets ASTM A108 standards.

• High-Strength Alloy Steel – Made from 4140 Chromoly steel, known for exceptional tensile strength, torsional strength, and fatigue resistance in demanding environments.
• Precision Cold Finished & Annealed – Cold finished for improved dimensional accuracy and surface finish; annealed for enhanced ductility and machinability.
• Unpolished Mill Finish – Features an unpolished surface, suitable for machining, heat treatment, and fabrication to meet specific industrial needs.
• Versatile Industrial Use – Ideal for making shafts, gears, spindles, bolts, pistons, collars, valves, and sprockets in high-stress mechanical and structural applications.
• Meets ASTM A108 Standard – Manufactured to ASTM A108 specifications for consistency and performance in aerospace, automotive, oil & gas, and heavy machinery sectors.