XMVB Bearing

Reference

Technical information

Legacy bearing tolerance, material, clearance and conversion references preserved as static documents.

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%
AISI52100 0.95-1.05 0.15-0.3 0.25-0.45 <0.025 <0.025 1.3-1.6
AISI440C 0.90-1.05 <0.8 <0.8

<0.04

 <0.03 16-19

Country China ISO U.S.A Germany Japan Sweden
Bearing Steel No. GCr15 683/XVII1 (AISI)52100 (Din)100Cr6 (Jis)SVJ2 SKF3

3.  Bearing Precision Grade

Standards Precision Grade
GB G E D C B
ISO Normal Class Class6 Class5 Class4 Class2
ANSI ABEC-1 ABEC-3 ABEC-5 ABEC-7 BEC-9
DIN P0 P6 P5 P4 P2
JIS 0 6 5 4 2

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 Series Diameter Series Diameter Series
Z1 Z2 Z1 Z2 Z3 Z1 Z2 Z3
4 34 32 35 32 30 36 33 31
5 36 34 37 34 32 37 35 33
6 36 34 37 34 32 37 35 33
7 38 35 38 36 34 -- -- --
8 38 35 38 36 34 -- -- --
9 40 36 40 37 35 -- -- --
10 42 38 42 39 35 44 40 37
12 43 39 43 39 35 45 40 37
15 44 40 44 41 36 46 42 38
17 44 40 45 41 36 47 42 38
20 45 41 46 42 38 48 43 39

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

Bore Diameter
d
mm 		V1 V2 V3
Low Frequency Medium Frequency High Frequency Low Frequency Medium Frequency High Frequency Low Frequency Medium Frequency High Frequency
5 90 60 50 58 36 30 35 21 18
6 90 60 50 58 36 30 35 21 18
7 110 80 65 72 48 40 44 28 24
8 110 80 65 72 48 40 44 28 24
9 110 80 65 72 48 40 44 28 24
10 140 100 85 90 60 50 55 35 30
12 140 100 85 90 60 50 55 35 30
15 180 130 100 110 78 60 65 46 35
17 180 130 100 110 78 60 65 46 35
20 220 160 125 130 100 75 80 60 45
22 220 160 125 130 100 75 80 60 45
25 220 160 125 130 100 75 80 60 45

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