EN31 Bearing Steel
Classic bearing-quality steel, through-hardening to high, uniform hardness. Chosen for rolling contact fatigue resistance.
Chemical Composition
| Element | Percentage (% by weight) |
|---|---|
| C | 0.95 - 1.1 |
| Cr | 1.3 - 1.6 |
| Mn | 0.25 - 0.45 |
| Si | 0.15 - 0.35 |
Mechanical Properties
- Hardness (HRC)
- 60 to 66
Also known as
Direct equivalents
Same material sold under a different naming standard.
Typical Applications
- Ball and roller bearings
- Precision shafts
- High-wear pins and bushings
Buying This Grade in Pakistan
The standard bearing steel for local bearing reconditioning and precision shaft work. Karachi and Lahore machine shops that manufacture or regrind rollers, pins, and bushings for industrial machinery are the natural buyer, distinct from the general forging trade that buys 4140 or 8620.
Related reading
- EN31 bearing steel: what "through-hardening" actually buys you
EN31, also known as 52100, is the standard bearing steel. Here's what through-hardening means in practice and where the grade is actually used.
- Bearing and precision shaft steel: EN31 and where it's used locally
EN31 bearing steel serves a narrower, more technical buyer than general forging steel. Here's what it's for and who in Pakistan actually needs it.
Grade Family
High-carbon chromium bearing steel
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