AISI 4140 Bolting Products
AISI 4140 is listed in the CHROMIUM MOLYBDENUM STEEL material family. The reference data below should be checked against the governing product specification, product form and delivery condition before selection or certification.
The reference chemistry table for AISI 4140 lists Carbon (C): Grade-specific / specification dependent; Silicon (Si): Grade-specific / specification dependent; Manganese (Mn): Grade-specific / specification dependent; Chromium (Cr): Grade-specific / specification dependent. Confirm exact limits and analysis tolerances against the governing standard and product form.
The mechanical-property table for AISI 4140 lists Tensile Strength: Specification / condition dependent MPa; Yield Strength: Specification / condition dependent MPa; Elongation: Specification / condition dependent %; Hardness: Specification / condition dependent HB / HRC. These are reference entries; supplied condition, dimensions, test method and governing specification control the requirements, and the figures are not design allowables.
Werkstoff / EN cross-reference for AISI 4140: 1.7225. This comparison does not guarantee interchangeability; confirm chemistry, product form and condition against the governing specification.
View Technical Information →Identification information for AISI 4140. Exact designation equivalents depend on the governing material standard and product form.
The reference chemistry table lists Carbon (C): Grade-specific / specification dependent; Silicon (Si): Grade-specific / specification dependent; Manganese (Mn): Grade-specific / specification dependent; Chromium (Cr): Grade-specific / specification dependent. Confirm the governing standard, product analysis tolerances and product form before ordering.
| Element | Symbol | Composition |
|---|---|---|
| Carbon | C | Grade-specific / specification dependent |
| Silicon | Si | Grade-specific / specification dependent |
| Manganese | Mn | Grade-specific / specification dependent |
| Chromium | Cr | Grade-specific / specification dependent |
| Nickel | Ni | Grade-specific / specification dependent |
| Molybdenum | Mo | Grade-specific / specification dependent |
| Vanadium | V | Grade-specific / specification dependent |
| Other Alloying Elements | — | Grade-specific / specification dependent |
| Other Elements | — | Grade-specific / specification dependent |
The table reports Tensile Strength: Specification / condition dependent MPa; Yield Strength: Specification / condition dependent MPa; Elongation: Specification / condition dependent %; Hardness: Specification / condition dependent HB / HRC as reference data for AISI 4140. Actual requirements depend on condition, dimensions, test method and specification; these values are not design allowables.
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | Specification / condition dependent | MPa |
| Yield Strength | Specification / condition dependent | MPa |
| Elongation | Specification / condition dependent | % |
| Hardness | Specification / condition dependent | HB / HRC |
Indicative physical-property values for alloy steels; exact values vary by grade and should be confirmed from the relevant specification.
Chromium molybdenum steels are widely used low-alloy steels selected for hardenability, strength, toughness and dependable performance after heat treatment. Exact characteristics vary with the individual grade, product form and heat-treatment condition.
Chromium and molybdenum contribute to improved hardenability and heat-treatment response.
Quench-and-temper processing can provide high strength in suitable grades and sizes.
Properly selected and heat-treated grades can provide useful combinations of toughness and strength.
The 41xx series covers a wide range of machinery and structural component requirements.
AISI 4140 belongs to the chromium molybdenum steel family and is selected for applications where the relevant strength, hardenability, wear resistance or toughness requirements are met by the specified grade and condition.
Used for power-transmission and rotating components.
Selected grades are used for high-strength fasteners and studs.
Used in axles, hubs, couplings and other forged engineering parts.
Applied where heat-treated strength and hardenability are required.
Select the exact AISI 4140 specification, product form and supply condition according to the required strength, toughness, wear resistance and service environment.
Heat-treatment parameters are grade-specific. Use the applicable specification and qualified processing procedure for hardening, tempering or case hardening.
Final mechanical properties depend on grade, section size and material condition. Confirm the required tensile strength, yield strength and hardness before selection.
The commonly listed Werkstoff / EN cross-reference for AISI 4140 is 1.7225. Treat this as a grade comparison, not a guarantee of interchangeability. Verify chemistry, product form, condition and governing specification against the supplier certificate before substitution.
The listed alloy-steel and tool-steel grades are generally selected for heat-treated service, but the exact treatment depends on the grade and required material condition.
Typical uses depend on the exact grade and condition and may include machinery parts, gears, shafts, fasteners, tooling or spring components within the relevant material family.
Use the applicable AISI, SAE or other governing specification and the material certificate for the supplied product form and condition.
Our engineering team can help you select suitable materials based on operating temperature, pressure and service conditions.