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ABIS Miniature and Precision Ball Bearings

With bores of 0.6 to 90mm and precision grades to ABEC 7

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Inch/Metric Bearing
Tolerance:
Desired Bore
Desired Outer Diameter
Material
Type
Closure

tolerances

For inch bearings tolerances are based on Section 3 of the AFBMA Standards for ABEC Class 1 and Section 12 for ABEC Class 3. Refer to Table 1.

For metric series bearings up to 9mm outer diameter tolerances are based on AFBMA Standards as above. For diameters over 9mm they are based on ISO R492-R1648 tolerances Class P0, P6 and P5. Refer to Tables 1 & 2.

N.B. Thin section bearings, Series E only, are available in tolerance Class P5. 

Table 1
Bearings with bore sizes 0-0.375 inches, 0-18mm. Outside diameters 0-30mm

 ABEC

Parameters

ISO

Unit 0.0001 Inch

Unit 0.001mm

Class 1

Class 3

 Class 5

Class 0

Class 6

Class 5

High

Low

High

Low

High  Low

Inner Ring Diameter

High

Low

High

Low

High

Low

0

-3

0

-3

0 -2

Mean value of bore dm

0

-8

0

-7

0

-5

+1

-4

+1

-3

0

-2

Absolute value of bore d

+2

-10

+1

-8

0

-5

3

-

2

- 1.5 -

Radial run out (max.)

10

-

6

5

0

-50

0

-50

 0 -10

Width B

0

-120

0

-120

0

-25

- - - - -  2

Width variation (max.)

12 - 15 - - 5

High

Low

High

Low

 High Low

Outer Ring Diameter

High

Low

High

Low

High

Low

0

-3

0

-3

 - -2

Mean value of OD (open) Dm

0

-8

0

-7

0

-5

+1

-4

+1

-4

 -  -2

Absolute value of OD (open) D

+2

-10

+1

-8

0

-5

+2

-5

+2

-5

 -

Absolute value of OD (closed) D

-

- - - - -

6

-

4

 2  -

Radial run out (max.)

15

-

8

-

5

-

0

-50

0

-50

 0  -10

Width B

0

-120

0

-120

0

-25

- -

+50

-10

 -  -

Flange diameter Df

+125

-50(1)

+125

-50(1)

- -
- -

0

-50

 -  -

Flange width Bf

0

-50(1)

0

-50(1)

- -

(1) Manufacturers tolerances

Table 2 
Bearings with bore sizes 20-34mm. Outside diameter 31-80mm. 

Parameters

ISO

Unit 0.001mm

Class 0

Class 6

Class 5

Inner Ring Diameter

20-30

35-45

20-30

35-45

20-30

35-45

High

Low

High

Low

High

Low

High

Low

High

Low

High

Low

Mean value of bore dm

0

-10

0

12

0

-8

0

-10

0

-6

0

-8

Absolute value of bore d

+3

-13

+3

-15

+1

-9

+1

-11

0

-6

-

-8

Radial run out (max.)

13

-

15

-

8

-

10

-

4

-

5

-

Width B

0

-120

0

-120

0

-120

0

-120

0

-120

0

-120

Width variation (max.)

20

-

20

-

20

-

20

-

5

-

5

-

Outer Ring Diameter

32-50

52-80

32-50

52-80

32-50

52-80

High

Low

High

Low

High

Low

High

Low

High

Low

High

Low

Mean value of OD (open) Dm

0

-11

0

-13

0

-9

0

-11

0

-7

0

-9

Absolute value of OD (open) D

+3

-14

+4

-17

+2

-11

+2

-13

0

-7

0

-9

Absolute value of OD (closed) D

+7

-18

+10

-23

+6

-15

+7

-18

- - - -

Radial run out (max.)

20

-

25

-

10

-

13

-

7

-

8

-

Width B

0

-120

0

-120

0

-120

0

-120

0

-120

0

-120

 

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