• ABIS Miniature and Precision Ball Bearings

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

  • FEY Labyrinth Sealing Rings

    Protect components in dirty and abrasive environments up to 700oC

  • Fuji Bearing Lock Nuts

    eliminate keyways and tab washers

  • GRW High Precision Ball Bearings

    High precision ball bearings in grades up to ABEC 9 with bores from 1 to 30mm and comparable inch dimensions

  • Schnorr Disc Springs

    Disc Spring Engineering
    Maximum load - minimum space - maximum flexibility

  • Schnorr Load Washers

    Have been specially developed for high strength bolts of grades 8.8 to 12.9.

  • Schnorr Safety Washers

    Reliable and economic fasteners

  • Secure Bolt Fasteners

    Vibration and shock resistant fasteners

  • Schnorr Bar Springs

    Simple  - More compact - More rugged - Longer lasting - Error free assembly

  • RBC Thin Section Ball Bearings

    RBC thin section ball bearings are engineered to solve a variety of design problems that cannot be solved with conventional ball bearings.

Home > ABEC Tolerance

ABEC Tolerance

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

 

 

General Information