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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

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

misalignment

The misalignment of a bearing is the degree to which both rings can be titled relatively to each other. The misalignment angle depends on the radial clearance and the internal geometry of the bearing.

Too much misalignment of the rings should always be avoided, as even a small angle of 2’ to 3’ increases the noise level noticeably. Attention must be paid to accurate alignment when designing bearing seats and adjacent surfaces.

Figure 25 shows the free misalignment (without load) depending on radial clearance, for the complete bearing range.  

Figure 25 - click to enlarge

 

Example:
The minimum and maximum possible free misalignment is to be calculated for the ball bearing SS608 C4/8 GPR J:

The basic type 608 is assigned to graph 10 according to table 24. Vertical projection of the radial clearance limits 4 or 8mm gives 2 points of the corresponding graphs (10) which can be transferred to the left on the misalignment scale.

Thus:
The minimum possible free misalignment: βmin ≈ 13 minutes of angle
The maximum possible free misalignment: βmax ≈ 18 minutes of angle  

Basic

Type

Graph

Basic

Type

Graph

Basic

Type

Graph

681

1

695

8

1016

1

691

2

605

5

1191

1

68/1.5

1

625

9

1397

1

69/1.5

3

635

10

5/64

3

682

3

686

5

2380

3

692

3

696

6

3/32

4

67/2.35

3

626

10

3175

4

68/2.35

3

687

6

1/8A

4

68/2.5

3

697

8

1/8B

6

69/2.5

4

607

10

3967

6

60/2.5

4

627

10

4763A

6

673

4

688A

8

4763B

5

683

4

688

8

3/16

5

693

4

698

8

6350A

7

623

6

608

10

6350B

5

674

5

689

8

1/4A

7

684

6

699

9

1/4

10

694

7

609

10

7938

8

604

7

629

10

3/8

9

624

6

6800

9

634

9

6900

9

675

6

6000

10

685

7

Table 24: Assignment of the graphs for calculating the misalignment

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