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Spec

C %

Si %

Mn %

P %

S %

Cr %

Mo %

Ni

Hardne ss

Chrome
Steel

SAE52100

SUJ2

0.95 ~ 1.10

0.15-0.35

0.50
max

0.025
max

0.025
max

1.30
~ 1.60



64 HRC
max

Stainless

Steel

AISI440C

SUS440C

X105CrMo17

0.95 ~ 1.20

1.00
max

1.00
max

0.04
max

0.03
max

16.0

~18.0

0.75 max


58 HRC
max

KS440

ACD34

X65Cr13

0.60 ~ 0.75

1.00
max

1.00
max

0.03
max

0.02
max

11.5
~13.0

0.3 max


60 HRC
max

AISI420

SUS420

X20Cr13

0.26 ~ 0.35

1.00
max

1.50
max

0.04
max

0.03
max

12.0
~14.0



55 HRC
max

AISI304

SUS304

X5CrNi1810

0.08
max

0.75
max

2.00
max

0.045
max

0.03
max

18.0
~20.0


8.0
~ 10.5

39 HRC
max

AISI316

SUS316

X5CrNiMo17-12-2

0.08
max

1.00
max

2.00
max

0.045
max

0.03
max

16.0
~18.0

2.0
~ 3.0

10.0
 ~14.0

39 HRC
max

(a) Chemical composition of bearing steel

(b) Steel grades for EZO Japan bearings

Component

Chrome steel bearings

Stainless steel bearings

Inner and Outer Rings

SAE52100 / SUJ2 / 100Cr6

KS440 / ACD34 / X65Cr13

Balls

SAE52100 / SUJ2 / 100Cr6

AISI440C / SUS440C / X105CrMo17

Shield

SPCC steel strip

AISI304 / SUS304 / X5CrNi1810

Cage

SPCC steel strip

AISI304 / SUS304 / X5CrNi1810

or

AISI420 / SUS420 / X20Cr13

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Bearing Material Tables