4140 Round Bar: Material Profile
4140 is a common choice for components exposed to heavy loads, impact, and repeated stress.
The chromium-molybdenum composition supports through-hardening and consistent mechanical properties across a wide range of industrial applications.
Purchase to the controlling ASTM, SAE, AMS, or customer specification. Section size, supply condition, mechanical properties, surface limits, testing, and heat/lot traceability can change the acceptable material and processing route.
Key Characteristics
- High strength and toughness
- Good fatigue resistance
- Responsive to heat treatment
- Good abrasion resistance
Common Applications
- Drive shafts and axles
- Gears and couplings
- Tool holders
- Hydraulic cylinder rods and mold bases
Typical Chemical Range
| Element | Weight % |
|---|---|
| Carbon | 0.38–0.43 |
| Manganese | 0.75–1.00 |
| Silicon | 0.15–0.35 |
| Chromium | 0.80–1.10 |
| Molybdenum | 0.15–0.25 |
| Phosphorus (max) | 0.035 |
| Sulfur (max) | 0.040 |
Chemistry ranges are general reference values. The purchase specification and material certification govern the order.
Request Pricing for 4140 Round Bar
The material field is prefilled with 4140 and remains editable. Add the specification, size, condition, quantity, processing, testing, required date, and ship-to location.
