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1.  Characteristics of Various of Bearings

2.  Material

- The rings, balls, needles and rollers of MVB bearings can be made of refining bearing steel AISI52100, stainless steel AISI440C, AISI420, etc.

- Cages are normally punch-pressed from brass strips H62 or steel strips 08, SPCC BQB402, as well as stainless steel strips AISI304, AISI302, fiber reinforced phenolic resin, plastics or copper stock, etc;

- The shields can be made of Japanese SPCC JISG3141 or stainless steel AISI304 or AISI302.

- Seals: synthetic rubber hot pressed with phosphatizing steel (AISI304 or AISI302 may used for stainless steel bearings) skeleton

The chemical composition of bearing steel and stainless steel are listed as follows:

Steel No.c%Si%Mn%S%P%Cr%
AISI521000.95-1.050.15-0.30.25-0.45<0.025<0.0251.3-1.6
AISI440C0.90-1.05<0.8<0.8

<0.04

<0.0316-19

CountryChinaISOU.S.AGermanyJapanSweden
Bearing Steel No.GCr15683/XVII1(AISI)52100(Din)100Cr6(Jis)SVJ2SKF3

3.  Bearing Precision Grade

StandardsPrecision Grade
GBGEDCB
ISONormal ClassClass6Class5Class4Class2
ANSIABEC-1ABEC-3ABEC-5ABEC-7BEC-9
DINP0P6P5P4P2
JIS06542

4.  Rolling Bearing's Tolerance

Precision of radial bearings (excepting taper roller bearings)

Precision of taper roller bearings

Precision of thrust ball bearings

Precision of conic bore radial bearings

5.  Deep Groove Ball Bearing's Vibration and Noise Class

The vibration and noise of deep groove ball bearings are normally classified as Z1, Z2(higher class than Z1), and Z3 (highest class). It is usually measured by instrument of SO910-1. While for bearings used for electric motors, the vibration & noise is measured by BVT-1 and classified as EMQ ZV1, ZV2 and ZV3. Customer needs to mark the requirement of vibration and noise class in order.

Bearing Vibration speed Grade can not be over the following Values(dB)

Bore Diameter (mm)Diameter SeriesDiameter SeriesDiameter Series
Z1Z2Z1Z2Z3Z1Z2Z3
43432353230363331
53634373432373533
63634373432373533
73835383634------
83835383634------
94036403735------
104238423935444037
124339433935454037
154440444136464238
174440454136474238
204541464238484339

Single Bearing Vibration Speed Grade Allowed The Limit Value(um/s)

Bore Diameter
d
mm
V1V2V3
Low FrequencyMedium FrequencyHigh FrequencyLow FrequencyMedium FrequencyHigh FrequencyLow FrequencyMedium FrequencyHigh Frequency
5906050583630352118
6906050583630352118
71108065724840442824
81108065724840442824
91108065724840442824
1014010085906050553530
1214010085906050553530
151801301001107860654635
171801301001107860654635
2022016012513010075806045
2222016012513010075806045
2522016012513010075806045

6.  Bearing's Internal Radial Clearance of ...

Deep Groove Ball Bearings

Matched Angular Contact Ball Bearings

Double Row Angular Contact Ball Bearings

Self-aligning Ball Bearings

Electrical Motor Bearings

Cylindrical Roller Bearings Needle Roller Bearings

Spherical Roller Bearings

7.  ISO1132/GB4199 Bearing Tolerance Symbols Definitions

8.  Characteristics of grease lubrication

9.  inch-mm conversion table