Bearing Material

Steel No.

Chemical composition %

C

Si

Min

P

S

Cr

Mo

Cu

Ni

GCr 15

0.95-1.05

0.15-0.35

0.25-0.45

s0.025

s0.025

1.40-1.65

-

s0.25

s0.30

Specification

Trademark

Chemical composition (%)

C

Si

Mn

P

S

Cr

Mo

GB 3086

9Cr18

0.90-1.00

Below 0.80

Below 0.80

Below 0.35

Below 0.30

17.00-19.00

JIS G 4303

SUW440C

0.95-1.20

Below 1.00

Below 1.00

Below 0.40

Below 0.30

16.00-18.00

Below 0.75

1．CROWN RETAINER： The standard metal crown retainer is very light weight, with specially coined ball pockets to reduce torque and provide smooth running characteristics. Material used is 400 series stainless steel.

2．RIBBON RETAINER： The closed pocket design of the ribbon retainer is the most common type. The material used is 300 series stainless steel. For low torque applications, a loose clinched ribbon retainer may be available.

3．PHENOLICRETAINER： Plastic crown retainers have the highest speed ratings of any standard retainer type, but have limited availability.