AISI 4140 Steel — Specifications & Listings
SAE/AISI — Chrome molybdenum alloy steel, high strength and toughness
Grade Details
| Grade | AISI 4140 |
| Standard | SAE/AISI |
| Description | Chrome molybdenum alloy steel, high strength and toughness |
| Applications | Gears, shafts, dies, bolts, crankshafts, tooling |
Equivalent / Similar Grades
Chemical Composition (%)
| C |
Mn |
Cr |
Mo |
Si |
S |
P |
| 0.38–0.43 |
0.75–1.00 |
0.80–1.10 |
0.15–0.25 |
0.15–0.35 |
≤0.040 |
≤0.035 |
Mechanical Properties
| Tensile Strength |
850–1000 MPa |
| Yield Strength |
≥680 MPa |
| Elongation |
≥13% |
| Hardness |
248–302 HB |
| Impact (Charpy) |
≥54 J |
Typical Available Sizes
| Round Bar |
16mm–350mm dia |
| Flat Bar |
20×8mm–250×75mm |
| Hex Bar |
19mm–100mm A/F |
Sizes are indicative. Contact seller for exact availability.
Active AISI 4140 Listings on M-EX