UNDERSTAND THE PARAMETERS OF BEARING

ICV World CO.,Ltd 17/12/2020
understand-the-parameters-of-bearing

Numbers in bearing codes can all represent different meanings. Understanding these numbers makes it easy to grasp technical information of each bearing code, including: Size, load capacity, gap, etc.

1. Dimension of bearings

The last two digits are in the bearing code 00-99 to indicate the inner diameter of the bearing. The inner diameter of the bearing will be equal to the value of these 2 digits multiplied by 5 and give a result in mm except:

Code with tail 00: inner diameter of bearing is 10mm.
Code with tail 01: inner diameter of bearing is 12mm.
Code with tail 02: inner diameter of bearing is 15mm.
Code with tail 03: inner diameter of bearing is 17mm.
For example the bearing code: 6230, we take 30 times 5 to get 150mm. This is the value of the inner diameter of this bearing.

2. Capacity of bearings

Bearing capacity is shown in the number 3 from right to left on the bearing code.

1 or 7

Very light load

2

Light load only

3

Average load only

4

Heavy load only

5

Only very heavy load

6

Only average load like number 3 but thicker

8-9

Only very, very light load

 

3. Meaning of bearings' classification

The fourth digit from right to left indicates the bearing from 0-9

0

1 layer ball

1

Double-layer ball

2

1 layer short roller ball

3

Two-layer short roller ball

4

1 layer long roller ball

5

Twisted roller ball

6

Block roller round ball

7

Tape roller ball

8

Not radial block ball

9

Block roller ball

 

4. The meaning of bearings' structure

The 5th digit from right to left represents its structure:

3

Cylindrical roller ball 1 row short, inner ring with no barrier

4

Same as 3, but with a barrier

5

There is 1 slot for mounting the positioning brake on the outer barrier

6

There is a thin ring to block oil in steel

8

There are two thin rings that block the oil in steel

9

Short cylindrical roller ball 1 row, in the inner ring has a rim that blocks the roller

 

 

555. Standard for clearance of bearings

Axle size

New ball

New roller ball

Old ball alow

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. Standard for clearance of bearings

Diameter of the shaft

Clearance between shaft and silver ring

 

<1000 v/p

>1000 v/p

 

Standard

Allow

Standard

Alow

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

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