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Table of Contents: Bearing Types
1. What is Bearing Number Meaning ?
2. Bearing Number Meaning of Deep Groove Ball Bearings
3. Bearing Number Meaning of Angular Contact Ball Bearings
4. Bearing Number Meaning of Spherical Ball Bearings (Self-aligning Ball Bearing)
5. Bearing Number Meaning of Spherical Roller Bearing
6. Bearing Number Meaning of Cylindrical Roller Bearing
7. Bearing Number Meaning of Tapered Roller Bearing
8. Bearing Number Meaning of Spherical Plain Bearing
Bearing number is made by numbers and codes, it represented type, size, cover, etc.
|
Name
|
HRC
|
|
Chrome steel
|
60~65
|
|
Stainless steel
|
52~62
|
|
Carbon steel
|
55~60
|
|
Ceramic
|
70~80
|
|
Type Code
|
Meaning
|
|
N
|
Snap ring groove
|
|
NR
|
Snap ring and groove
|
|
Blank
|
Open, no sealed
|
|
RS
|
One side rubber sealed
|
|
2RS
|
Double side rubber sealed
|
|
Z
|
One side metal sealed
|
|
ZZ
|
Double side metal sealed
|
|
LLU
|
Tight contact
|
|
LLH
|
Light contact
|
|
LLB
|
Non-contact
|
Learn more: Tolerance 
Learn more: Radial Play
|
Clearance
|
Use situation
|
Use example
|
|
C2、C0
|
Strict requirements to control noise and vibration, precise installation and coordination, and high positioning
|
Instruments, instrumentation equipment, electric motors, low noise, small motors, etc.
|
|
C0
|
General load, speed, working temperature is not high
|
Transmission machinery, reducer and other general machinery, etc.
|
|
C3
|
High temperature and high speed, high service life requirements
|
Car alternator
Engine
etc.
|
|
C3、C4
|
Use the occasions where the ambient temperature is high and it is not suitable for heat dissipation
|
Dryers
Paper machines
etc.
|
|
C4
|
High temperature and high speed, large impact load
|
Vibrating screen
Speed gear, etc.
|
|
C5
|
The inner and outer rings adopt the interference fit, the interference is large, the temperature is high, and the heat is not dissipated.
|
Vibration roller
Rear wheel of automobile and locomotive
etc.
|
Deep Groove Ball Bearings
What do these numbers mean with regard to bearings, e.g. 6202, 6203 and so on?
2.1. TYPED
|
Typed Code
|
Meaning
|
|
1
|
Self-aligning Ball Bearing
|
|
2
|
Spherical ball bearing
|
|
3
|
Double row Angular contact Ball Bearing
|
|
4
|
Double row ball bearing
|
|
5
|
Thrust ball bearing
|
|
6
|
Single row deep groove ball bearing
|
|
7
|
Single row angular contact
|
2.2. TOUGHNESS
|
Toughness Code
|
Meaning
|
|
0
|
Extra Light
|
|
1
|
Extra light thrust
|
|
2
|
Light
|
|
3
|
Medium
|
|
4
|
Heavy
|
|
8
|
Extra Thin Section
|
|
9
|
Very Thin Section
|
2.3. INNER DIAMETER
|
Miniature ball bearing (6xx)
|
|
Deep groove ball bearing (6xxx)
|
|
Last yards
|
Inner diameter
|
|
Last two yards
|
Inner diameter
|
|
1
|
1
|
00
|
10
|
|
2
|
2
|
01
|
12
|
|
3
|
3
|
02
|
15
|
|
4
|
4
|
03
|
17
|
|
5
|
5
|
after here (*5)
|
|
6
|
6
|
04
|
4*5=20
|
|
7
|
7
|
05
|
5*5=25
|
|
8
|
8
|
06
|
6*5=30
|
|
9
|
9
|
?
|
? *5
|
| |
Miniature
ball bearing
|
Deep groove
ball bearing
|
Thin wall
ball bearing
|
|
Inner diameter
|
Beyond 10mm
|
Over 10mm
|
Over 10mm
|
|
Model
|
6xx
|
6xxx
|
68xx、69xx
|
A. Small tips about Miniature ball bearing
EX. 682 2*5*1.5mm
JIS (From China) JIS (From China) NMB (From Japan)
682 = MR52 = L-520
B. To see further detail please refer to catalogue:
Further reading:
Miniature Bearings: Small Components, Great Effect
Dive into the Significance of Ball Bearing Sizes
Angular Contact Ball Bearings
Taking 7006 C as an example.
3.1. SERIES
7000、7200、7300、5200、5300
3.2. INNER DIAMETER
|
Last two yards
|
Inner diameter
|
|
00
|
10
|
|
01
|
12
|
|
02
|
15
|
|
03
|
17
|
|
after here (*5)
|
|
04
|
4*5=20
|
|
05
|
5*5=25
|
|
06
|
6*5=30
|
|
?
|
? *5
|
3.3. CONTACT ANGULAR
|
Code
|
Angular
|
|
A
|
30°
|
|
B
|
40°
|
|
C
|
15°
|
|
AC
|
25°
|
To see further detail please refer to catalogue:
Angular Contact Ball Bearings
Spherical Ball Bearings
Taking 1308 K as an example.
4.1. SERIES
1200, 1300, 2200, 2300, 11200, 11300
4.2. INNER DIAMETER
|
XXX
|
|
XXXX
|
|
Last yards
|
Inner diameter
|
|
Last two yards
|
Inner diameter
|
|
1
|
1
|
00
|
10
|
|
2
|
2
|
01
|
12
|
|
3
|
3
|
02
|
15
|
|
4
|
4
|
03
|
17
|
|
5
|
5
|
after here (*5)
|
|
6
|
6
|
04
|
4*5=20
|
|
7
|
7
|
05
|
5*5=25
|
|
8
|
8
|
06
|
6*5=30
|
|
9
|
9
|
?
|
? *5
|
4.3. Bore
Blank --- Round bore
K --- Conical bore
To see further detail please refer to catalogue:
Self-aligning Ball Bearings
Spherical Roller Bearings
Taking 22315 CD as an example.
5.1. SERIES
21000, 22000, 22200, 22300, 23000, 23100, 23200, 24000, 24100
5.2. INNER DIAMETER
Last two yards times 5
Ex. 22315 CD --- 75mm、24124 --- 120mm、23272 CAK --- 360mm
5.3. Bore
|
Retainer
|
|
CD
|
Steel retainer
|
|
CA
|
Copper retainer
|
|
Bore
|
|
Blank
|
Round bore (Standard)
|
|
K
|
Conical bore (taper 1:12)
|
|
K30
|
Conical bore (taper 1:30)
|
To see further detail please refer to catalogue:
Spherical Roller Bearings
Cylindrical Roller Bearings
Taking NU2214 EWS as an example.
6.1. SERIES
NU、NJ、NUP、N、NF、NH、NNU、NN
6.2. LEVEL
|
CODE
|
Meaning
|
|
2XX
|
Light
|
|
3XX
|
Medium
|
|
4XX
|
Heavy
|
|
10XX
|
Extra light
|
|
22XX
|
Light, wide
|
|
23XX
|
Medium, wide
|
6.3. INNER DIAMETER
Last two yards times 5
Ex. NU2214 EWS--- 70mm、NU409 --- 45mm、NJ330 EM--- 150mm
Design & Cage
|
Code
|
Meaning
|
|
E
|
High-Capacity Design
|
|
T
|
Polyamide Cage
|
|
M
|
Machined Brass Cage
|
|
W，WS
|
Pressed Steel
|
To see further detail please refer to catalogue:
Cylindrical Roller Bearings
Tapered Roller Bearings
Taking HR30203 XJ as an example.
7.1. DESIGN
HR – High Capacity
7.2. SERIES
30200、30300、31300、32000、32200、32300、32900、33000、33100、33200
7.3. INNER DIAMETER
|
Last two yards
|
Inner diameter
|
|
00
|
10
|
|
01
|
12
|
|
02
|
15
|
|
03
|
17
|
|
after here (*5)
|
|
04
|
4*5=20
|
|
05
|
5*5=25
|
|
06
|
6*5=30
|
|
?
|
? *5
|
|
special bore size
|
|
/22
|
22
|
|
/28
|
28
|
|
/32
|
32
|
7.4. Contact angle & Interchangeability
|
Code
|
Meaning
|
|
Contact Angle
|
|
Blank
|
Standard angle (15ß to 17ß)
|
|
C
|
Medium angle (17ß to 24ß)
|
|
D
|
Steep angle (24ß and over)
|
|
Interchangeability
|
|
J
|
Cup angle and raceway diameter conform to ISO 355
|
|
X
|
Dimension series 32000 and 32900 the major dimensions conform to ISO 355
|
To see further detail please refer to catalogue:
Spherical Plain Bearings
Taking GE12E, and PHS 8 as an example.
8.1. SERIES
GE、SB、PHS、POS、RBH、CF、CFH
8.2. INNER DIAMETER
The numbers in these bearing number are exactly their inner diameter.
Ex. GE12E --- 12mm、PHS 8 --- 8mm、SB 25 --- 25mm、CF 10 --- 10mm …
To see further detail please refer to catalogue:
Spherical Plain Bearings
Further reading:
Understanding Features and Applications of Spherical Bearings (Also Known As Ball Joint Bearings)
Why is ISK BEARINGS frequently chosen as the specified bearing brand by major international companies?
ISK
- With over 30 years of bearing manufacturing experience.
- Committed to providing solutions that best fit your usage needs.
- Whether you're a large manufacturer or a startup, you can rely on our expertise and experience.
About ISK 
Our Commitment
- Assist customers in reducing trial and error costs and increasing production efficiency.
- Stringently control product quality, with factories certified by IATF16949, ensuring bearings meet the highest production quality standards.
- Meet RoHS, REACH environmental standards, and undergo SGS inspections.
Three Assurances
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