GRADE FAMILY · 6 GRADES
Bearing Steel
Bearing steels are high-carbon chromium steels, led by EN31 / 100Cr6 / SAE 52100, made for very high hardness and rolling-contact fatigue life. Cleanliness from the mill is as important as chemistry.
When to Choose Bearing Steel
- The part is a bearing race, ball, roller or bush
- Very high surface hardness is needed
- Rolling-contact fatigue limits the part's life
- Gauges and wear parts need dimensional stability
Bearing Steel Grades and Equivalents
Nearest equivalents in each standard. Grades with a page link to full chemistry, properties and match ratings.
| Grade | EN | W.Nr. | AISI / SAE | JIS | IS | GB | Supplied as |
|---|---|---|---|---|---|---|---|
| EN31 | 100Cr6 | 1.3505 | 52100 | SUJ2 | – | GCr15 | Round Bars · Bright Bars · Forged Bars · Forgings & Special Components |
| 100CrMo7-3 | 100CrMo7-3 | 1.3536 | 52100 | – | – | – | Round Bars · Bright Bars · Forged Bars · Forgings & Special Components |
| 100CrMnSi6-4 | 100CrMnSi6-4 | 1.3520 | – | SUJ3 | – | GCr15SiMn | Round Bars · Bright Bars · Forged Bars · Forgings & Special Components |
| SUJ3 | 100CrMnSi6-4 | – | – | SUJ3 | – | GCr15SiMn | Round Bars · Bright Bars · Forged Bars · Forgings & Special Components |
| SAE 51100 | – | – | 51100 | SUJ1 | – | – | Round Bars · Bright Bars · Forged Bars · Forgings & Special Components |
| M50 | – | – | M50 | – | – | – | Round Bars · Forged Bars |
GRADE NOT LISTED?
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OneKaizen sources from mills across India, Europe and Asia. Send the designation, standard, form, size and quantity and we will confirm availability and the nearest equivalent.