How to read bearing parameters

Wednesday - 02/01/2019 04:02

When using the bearing, we see the parrameter. The information on the bearing is a range of letters and number which shows information of; type of bearing, dimensions, accuracy, and other parameters  etc. So, How to understand the parameters correctly, this articale may be useful: 

vong bi 2

1.According to  TCVN 3776-83 the bearing parameter will be understood as following: 

- Ball bearing is abbriviated by numbers. Two last numbers show the inner diameter from 20 to 495 mm, these number is as 1/5  as the real dimensions. The number has inner diameter from 10 to 20 mm signed 00 (10mm), 01 (12mm), 02 (15mm), 03 (15mm), 03 (17mm).
For example: The number 150212 on the bearing mean: 1 range bearing  (0), outer ring (5), light load (2), width (1), inner diameter 60 mm (12×5).
- Other examples:
thong so vong bi

 

vong bi skf 7

2. Meaning of load :

- The third number from right to left. 

1 or 7

Very light load 

2

 Light load only

3

Medium load only 

4

Heavy load only

5

Very heavy load only

6

Medium load same as 3 but it's thicker 

8-9

Really load only; 814, 820, 914

 3. Meaning of classification:

 The 4th number from right to left indecates the bearing 0-9.    

0

The 1 layer ball bearing 

1

The 2 layer ball bearing 

2

1 layer short cylindrical roller  bearing 

3

2 layer short cylindrical roller  bearing 

4

1 layer long cylindrical rollerbearing 

5

Twisted cylindrical bearing 

6

Thrust ball bearing 

7

Tapered roller bearing 

8

Not radial thrust ball bearing

9

Cylindrical roller thrust bearings

4. Structural meaning :

 The number from right to left.  

3

1 row  cylindrical roller thrust bearing, burrless inner thrust ring without 

4

The same as 3  with barrier ring

5

1 groove baking in the outter ring 

6

1 basket stoping oil made of steel sheet

9

 1 row short thrust  cylindrical roller bearing, there is a ring thrusting the ballroller. 
 
For example:  Read the 60304 bearing paramaters.
-          ID 04x5 = 20mm
-          Load: Medium
-          1 layer ball bearing 
-          1 basket stoping oil made of steel sheet
Note : If there is 3 last number , the last number is ID (D<20mm).
        Ex : 678 , d=8mm, light load, thrust ball bearing 

5. Bearing gap:

Centre shaft dimension 

New spherical ball bearing 

New clindrical ball bearing 

Usable ball bearing 

20-30

0.01-0.02

0.03-0.05

0.1

30-50

0.01-0.02

0.05-0.07

0.2

55-80

0.01-0.02

0.06-0.08

0.2

85-120

0.02-0.03

0.08-0.1

0.3

130-150

0.02-0.03

0.10-0.12

0.3

6. Silver gap  :

Diameter of center shaft

Gap between shaft and silver bearing 

      
       

>1000 v/p
 

Standard

Allowance 

Standard

Allowance 

18-30

0.040-0.093

0.1

0.06-0.118

0.12

30-50

0.05-0.112

0.12

0.075-0.142

0.15

50-80

0.065-0.135

0.14

0.095-0.175

0.18

80-120

0.08-0.16

0.16

0.12-0.210

0.22

120-180

0.100-0.195

0.20

0.150-0.250

0.30

180-260

0.120-0.225

0.24

0.180-0.295

0.40

260-360

0.140-0.250

0.26

0.210-0.340

0.5

360-500

0.170-0.305

0.32

0.250-0.400

0.6

                                                                                                                                  Source: Internet
How to read bearing parametersi, air compressor bearings , bearing paremeters, bearing replecement of air compressor

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