AISI 4340 rods and bars are found widespread use in defense and aerospace applications in landing gear axles, shafts, and gears requiring exceptional toughness. They find applications in heavy machinery and automotive sectors for torsion shafts, crankshafts, and heavy-duty drive parts. The oil and gas industry uses them in couplings and valve stems that are stressed. They are also used in forging dies, drill collars, and tooling with high performance where fatigue strength and dimensional stability are of top concern. Their versatility sees them used in dynamic load applications requiring unyielding mechanical reliability.
The Alloy Steel AISI 4140 has approximately 0.40% carbon, 1% chromium, 0.25% molybdenum, 0.8% manganese, and 0.2% silicon. When tempered and quenched, tensile strength is between 850 and 1,100 MPa with yield strength approximately 650 MPa. The alloy exhibits high fatigue resistance, satisfactory notch toughness, and retains toughness at moderate to low temperatures. It is readily sharpened and weldable with proper treatment. These attributes make it strong, resilient, and versatile, allowing it to be a favored choice in mechanical engineering where strength and precision are equally valued.
| Dimensions | : | EN, DIN, JIS, ASTM, BS, ASME, AISI |
| Size | : | 5 mm To 500 mm |
| Diameter | : | 0.1 mm to 100 mm |
| Length | : | 100 mm To 3000 mm Long & Above |
| Finish | : | Black, Bright Polished, Rough Turned, NO.4 Finish, Matt Finish, BA Finish |
| Tolerance | : | H8, H9, H10, H11, H12, H13K9, K10, K11, K12 or as per clients’ requirements |
| Form | : | Round, Square, Hex (A/F), Rectangle, Billet, Ingot, Forging Etc. |
| Grade | C | Mn | Si | P | S | Fe | Mo | Ni | Cr |
| AISI / SAE 4140 | 0.38-0.43 | 0.75-1.00 | 0.20-0.35 | 0.035 max | 0.035 MAX | – | – | 0.15-0,25 | 0.80-1.10 |
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 7.85 g/cm3 | 1432 ℃ | 560 | 460 | 21.50% |
Alloy Steel AISI 4140 Bars and Rods are known for their excellent strength, toughness, and wear resistance. With a chemical composition that includes chromium and molybdenum, they offer improved hardness, fatigue resistance, and good machinability, making them ideal for demanding applications.
AISI 4140 Bars and Rods are commonly used in automotive, aerospace, oil and gas, construction, and heavy machinery industries. They are ideal for manufacturing parts such as gears, shafts, crankshafts, and axles that require high strength and durability.
Yes, Alloy Steel AISI 4140 Bars and Rods can be heat treated to achieve desired mechanical properties. Heat treatment processes such as quenching and tempering can increase hardness, strength, and toughness, making the material suitable for high-stress applications.
| STANDARD | WERKSTOFF NR. | UNS | JIS | BS | EN |
| AISI / SAE 4140 | 1.7225 | G41400 | SCM 440 | BS 708M40 | 1.7223 |
AISI 4140 rods and bars are typically applied to gears, shafts, pinions, spindles, and fasteners for automotive and machinery industries. They create high-strength valve stems and hydraulic fittings in hydraulics systems. They are also used as coupling elements in industrial drives and crane components. AISI 4140 is used by the oil and gas industry in pump parts and tubing connectors. Forging and pressing sectors apply it to tooling and dies that are exposed to cyclic loads. Its toughness, hardness, and machinability make it a perfect fit for elements that need to withstand stress without sacrificing precision.
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