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ENGINEERING

Standard Tolerances

ABMA/ISO Symbols – Outer Ring

Dmp

Single plane mean outside diameter deviation from basic outside diameter,i.e.,O.D. tolerance.

Kea

Radial runout of assembled bearing outer ring, i.e., radial runout of raceway.

VCs S

D

Outer ring width variation, i.e. parallelism.

Outside cylindrical surface runout with outer ring refernece face, i.e., squareness O.D. to face.

Sea

Axial runout af assembled bearing outer ring, i.e. lateral (axial) runout of raceway.

Cs

Single outer ring width deviation from basic, i.e., width tolerance.

Outer Ring ABEC – 7,9—ISO P4, P2 Depending upon the requirement, various degrees of bearing accuracy may be required.

Among the tolerance classes, ABEC-1 applies to ball bearings for normal usage. The other classes ABEC-3,5,7,9 apply to ball bearings of increased precision as required.

Values of tolerances ABEC-7 and ABEC-9 for superprecision ball bearings are shown below.

30

50

1 -2 /2

1 -1 /2

1

1/2

2

1

2

1

1 1 /2

1/2

-6

-4

2 12

1 1 ⁄2

5

1 2 ⁄2

5

1 2 ⁄2

4

1 1 ⁄2

50

80

-3

1 -1 /2

1

1/2

2

1 1/2

2

1 1/2

1 1 /2

1/2

-7

-4

3

1 1 ⁄2

5

4

5

4

4

1 1 ⁄2

180

250

-4 1/2

-3

3

1 1/2

-11

-8

7

4

ABEC

ABEC

ABEC

ABEC

ABEC

ABEC

7

9

7

9

7

9

4

3

4

3

3

1 1/2

10

7

10

7

7

4

0

18

1 -1 /2

-1

1

1/2

-4

-2 12

2 12

1 1 ⁄2

250

315

-5

-3

3

2

-13

-8

7

5

inch

inch

inch

inch

inch

inch

m

m

m

m

m

m

1

1/2

2

1/2

1 1 /2

1/2

3

1 1 ⁄2

5

1 1 ⁄2

4

1 1 ⁄2

1 1 /2

1

2

1

1 1 /2

1/2

4

1 2 ⁄2

5

1 2 ⁄2

4

1 1 ⁄2

1 4 /2

3

4

3

3

2

11

7

10

7

8

5

STANDARD ABEC TOLERANCES – OUTER RING All tolerances in number of ten-thousandths inches (.0001") and

Over

Incl.

inch

inch

inch

inch

mm

mm

m

m

m

m

120

150

1 -3 /2

-2

2

1

-9

-5

5

1 2 ⁄2

Kea

Sea

SD

Raceway

Raceway

Outside Diameter

Radial Runout

Axial Runout

Runout With Face

3

2

3

2

2

1

7

5

7

5

5

1 2 ⁄2

diameter of a

O.D. in a single radial plane, res

pectively) may fall outside

ulated. For fu

rther details see ABMA Standard

20 and Standard 4.

D Bearing O.D.

ABEC

ABEC

ABEC

ABEC

7

9

7

9

315

400

-6

-4

3

3

-15

-10

8

7

18

30

-2

-1 1/2

1

1/2

-5

-4

2 12

1 1 ⁄2

80

120

-3

-2

1 1 /2

1

-8

-5

4

1 2 ⁄2

1 2 /2

2

1 2 /2

2

2

1

6

5

6

5

5

1 2 ⁄2

5

3

5

3

4

3

13

8

13

8

10

7

2

micrometers (m)

150

180

-4

-3

2

1

-10

-7

5

1 2 ⁄2

3

2

3

2

2

1

8

5

8

5

5

1 2 ⁄2

(1) DMIN and DMAX (the smallest single diameter and the largest single limits shown. DMIN + DMAX in a single radial plane must be within O.D. diameter tab

MMV

  • Dmp

Outside Diameter(1)

+.0000",+.000mm to minus MMV

VCs Width Variation (Parallelism)

MMV

MMV

(Squareness)

MMV

102800

E5

ENGINEERING

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