5140
Data verified5140 is a medium-carbon chromium steel for moderately loaded shafts, gears and bolts — the chromium-only (no molybdenum) economy alternative to 4140.
Chemical composition
| Element | Content (%) |
|---|---|
| C | 0.38–0.43 |
| Si | 0.15–0.35 |
| Mn | 0.70–0.90 |
| Cr | 0.70–0.90 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Hardness (Q&T) | 28–38 HRC typical |
| Tensile strength | 850–1050 MPa (Q&T) |
| Density | 7.85 g/cm³ |
Heat treatment
Quench 840–870 °C oil; temper 450–650 °C.
Equivalent grades
| Standard | Designation |
|---|---|
| din | 1.7035 (41Cr4) |
| aisi | 5140 |
| jis | SCr440 |
| gb | 40Cr |
Compare side by side: 5140 vs 40Cr
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Shafts, gears, tie rods, fasteners, agricultural machinery parts.
Processing: Machines well; weld with preheat. Often induction hardened for wear surfaces.
FAQ
- 5140 or 4140?
- 4140 adds molybdenum: better hardenability and temper resistance for thicker or hotter parts. For thin sections at lowest cost, 5140/40Cr is enough.
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Ask for a quotationVisit NasteelSource: SAE J404 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.