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Ⅰ. Material
Rings and balls of ISK bearings are made of refined chrome steel GCr15 (AISI 52100). The retainers are made of either brass (H62) or fine cold rolled steel (SPCC BQB402) by stamping. They can also, if necessary, be made of reinforced industrial plastic. The shields are made of imported special material (SPCC JISG3141) or stainless steel (ICr18Ni9). And the seals are made of phosphating steel structure and NBR by hot pressing.

Composition of chrome steel is as below:

Steel No

C%

Si%

Mn%

S%

P%

Cr%

GCr15

0.95~1.05

0.15~0.3

0.25~0.45

<0.025

<0.025

1.3~1.6

 

Ⅱ. Tolerance
ISK bearing is of normal level in general. For the precision tolerance of the mostly used normal level bearing (level 0), please refer to the following. In case you have any demand for other precision level, please be sure to specify when order.

INNER RING

d
mm

△dmp

Vdp
diametral series

Vdmp

Kia

△Bs

VBs

9 0,1 2,3,4

over

to

max

min

max

max

max

max

min

max

2.5
10
18

10
18
30

0
0
0

-8
-8
-10

10
10
13

8
8
10

6
6
8

6
6
8

10
10
13

0
0
0

-120
-120
-120

15
20
20

OUTER RING

D
mm

△Dmp

VDp

VDmp

Kea

△Cs

VCs

open

close

9

0,1 2,3,4

2,3,4

over

to

max

min

max

max

max

max

min

max

6
18
30

18
30
50

0
0
0

-8
-9
-11

10
12
14

8
9
11

6
7
8

10
12
16

6
7
8

15
15
20

These will be the same as the
bearing's △ Bs and VBs

Ⅲ. Radial Play
conformable to the GB4604 standard, the radial play of the bearings is divided into five groups as below:

Bearing Bore-mm
Bearing Bore-mm

Group2-C2
Group2-C2

Basic Group C0
Basic Group C0

Group 3-C3
Group 3-C3

Group 4-C4
Group 4-C4

Group 5-C5
Group 5-C5

over
Over

to
inct

min
min

max
Max

min
min

max
Max

min
min

max
Max

min
min

max
Max

min
min

max
Max

2.5

6

0

7

2

13

8

23

-

-

-

-

6

10

0

7

2

13

8

23

14

29

20

37

10

18

0

8

3

18

11

25

18

33

25

45

18

24

0

10

5

20

13

28

20

36

28

48

▲In case you have any demand for other radial or axial play, please be sure to specify when order and we'll make the bearings accordingly.

Ⅳ. Shields,Seals and Lubricant
The bearings can be classified into open type, single or double shield (Z, ZZ) type and single or double seal (RS, 2RS) type. Upon leaving the factory, an appropriate amount of anti-rusting oil or grease will be applied to the bearings so that they can be put to use after delivery without further cleaning and will work properly under light to medium load, low to medium RPM, at a temperature range from -20℃ to 110℃. In case you are to use the bearings under special working condition, please be sure to specify the exact brand and amount of the grease to be applied when order. For the characteristics and application of popular grease, please refer to the following:

Serial number

Item name

Dropping Point℃

Penetration

Working temperature ℃

Color

1

SHELL grease
 Alvania RLQ2(low noise)
 AeroShell Grease 7
 AeroShell FLUID 12
also available :
 Alvaina RL2,RL3,EP2,EP0etc


185
260


265-95
288


-25~100
-70~150


light brown and brown

2

CHEVRON grease
 Chevron SRLGrease NLGI2


243


195-265


-29~177


jade green

3

ESSO grease
 ANDOK C (US original)
 BEACON 325 (US original)
 EM (US original)


260
190


190-210
280


-30~120
-54~125
-40~150


brown
light brown
blue

4

MOBIL grease
 HP grease( US original)
 28# aviation grease


260
260


265-295
285


-30~110
-60~180


dark blue
dark red

5

Japanese Kyodo yushi
 Kyodo SRL
 Kyodo PS2


190
170


240-270
265-295


-50~150
-50~130


light brown
peach white

6

KLUBER grease
 Isoflex super LDS 18
 Petamo GHY 133
 Stabu RAS NBU 12/300KP


185
>240
>200


265-295
250-280
285-315


-55~120
-25~150
-20~140


Yellow
light brown

7

US DU PONT fluoridized grease
 Krytox GPL 226
 Krytox GPL 227
 Krytox GPL 407

 

 


-26~260
-29~288
315


white

8

Tianjin Hangu No. 2
 MOTOR No.2

 

 


-10~110


green

Ⅴ.limits of Bearing coordination installment table
limits of Bearing record table-1
limits of Bearing record table-2