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ENGINEERING

ABMA/ISO Symbols – Inner Ring

dmp

Single plane mean bore diameter deviation from the basic bore diameter,i.e.,bore tolerance.

Kia

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

VBs S

d

Inner ring width variation, i.e. parallelism.

Inner ring reference face runout with bore, i.e., squareness – bore to face.

Sia

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

Bs

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

Standard Tolerances

Inner 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.

50

80

-3

1 -1 ⁄ 2

1 1 ⁄2

1 2

1 1 ⁄2

1

2

12

2

1

0.0059

-7

-4

4

1 1 ⁄2

4

1 2 ⁄2

5

1 12

5

1 2 ⁄2

0.15

80

120

-3

-2

1 1 ⁄2

1

2

1

2

1

2

1

0.0079

-8

-5

4

1 2 ⁄2

5

1 2 ⁄2

5

2 12

5

1 2 ⁄2

0.20

ABEC

ABEC

ABEC

7

9

7,9

inch

inch

inch

m

m

m

1

1 2

0.0016

3

1 1 ⁄2

0.04

1

1 2

0.0031

Width Tolerances: The width tolerances for individual inner and outer rings are shown in the above table but, to allow for the face grinding on two bearings for various preloads, the total width tolerances of duplex pairs of bearings are as shown.

E4

d

dmp

VBs

Kia

Sd

Bearing Bore

Bore Diameter(1)

Width Variation

Raceway

Face Runout

(Parallelism)

Radial Runout

With Bore

10

18

1 -1 ⁄2

-1

1

1 2

1

1 2

1

12

-4

1 -2 ⁄ 2

2.5

1 1 ⁄2

1 2 ⁄2

1 1 ⁄2

3

1 12

150

180

-4

-3

2

1 1 ⁄2

1 2 ⁄2

2

1 2 ⁄2

1 12

3

2

0.0098

-10

-7

5

4

6

5

6

4

7

5

0.25

Over

Inclusive

Maximum

Minimum

0

200

.000"

.010"

1 12

1

0.0047

4

1 2 ⁄2

0.12

Sia Raceway Axial Runout

MMV

  • Bs & Cs

Width Inner & Outer Rings +.0000",+.000mm to minus

MMV

MMV

MMV

MMV

ABEC

ABEC

ABEC

ABEC

ABEC

ABEC

ABEC

ABEC

7

9

7

9

7

9

7

9

18

30

-2

-1

1

1 2

1

1

1 1 ⁄2

12

-5

1 -2 ⁄ 2

2.5

1 1 ⁄2

3

1 2 ⁄2

4

1 12

120

150

-4

-3

2

1

2

1

1 2 ⁄2

1

3

1

0.0098

-10

-7

5

1 2 ⁄2

5

1 2 ⁄2

6

2 12

7

1 2 ⁄2

0.25

1 12

1

0.0047

4

1 2 ⁄2

0.12

0.0118 0.30

pectively) may fall outside

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

3

1 1 ⁄2

0.08

0

10

1 -1 ⁄2

-1

1

1 2

1

1 2

1

12

-4

1 -2 ⁄ 2

2.5

1 1 ⁄2

1 2 ⁄2

1 1 ⁄2

3

1 12

30

50

1 -2 ⁄2

-1

1

1 2

1 1 ⁄2

1

1 1 ⁄2

12

-6

1 -2 ⁄ 2

3

1 1 ⁄2

4

1 2 ⁄2

4

1 12

(1)

dMIN and dMAX (the smallest single diameter and the largest single diameter of a bore in a single radial plane, res

20 and Standard 4.

Preloaded Duplex Set Width Tolerance

.00mm

.25mm

102800

+.0000",+.000mm

to minus

(Squareness)

3

2

8

5

Nominal bore

Width

Millimeters

Tolerance

Over

Incl.

inch

inch

inch

inch

inch

inch

inch

inch

mm

mm

m

m

m

m

m

m

m

m

limits shown. dMIN + dMAX in a single radial plane must be within bore diameter tabulated 2

. For further details see ABMA Standard

3

2

3

2

8

5

7

5

1 2 ⁄2

2

6

5

180

250

1 -4 ⁄2

  • -

    12

  • -

    3

  • -

    8

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