Plastic 4-Point Contact Ball Bearings

thin race bearings

KMS offers the unique "XR" series bearing style with 4-point contact deep ball groove geometry. This ball groove design enables the bearing to handle simultaneous radial, axial and moment loading while maintaining stiffness. As a bonus they also have minimal radial and axial play. The "XR" groove design will not lock up in the presence of off center loads. The load and speed calculations are for reference only.

The “XR” KMS Plastic Ball Bearing features Celcon® Acetal (POM) for races and ball retainer, and is fitted with 316 stainless balls. When Acetal plastic is not the right fit we have additional standard materials, Kynar® and PEEK, which offer additional benefits. For a list of alternative materials that are available see Semi-Custom Bearings.

KMS recommends testing in actual conditions expected in the applications. The information presented here is believed to be accurate at time of publication but is subject to change without notice.

These are made to order and minimum quantities may apply.

Specials are our Standard

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Set Descending Direction

21 Item(s)

Part # ID OD Width
XR3-6

3/16

1/2

5/32

Details

XR3A-6

3/16

5/8

0.196

Details

XR4-6

1/4

5/8

0.196

Details

XR4A-6

1/4

3/4

7/32

Details

XR4AW-6

1/4

3/4

9/32

Details

XR6-6

3/8

7/8

7/32

Details

XR6A-6

3/8

7/8

9/32

Details

XR8A-3/8B-6

3/8

1 1/8

3/8

Details

XR10B-3/8B-6

3/8

1 3/8

7/16

Details

XR8-1/2B-6

1/2

1 1/8

1/4

Details

XR8A-1/2B-6

1/2

1 1/8

3/8

Details

XR10B-1/2B-6

1/2

1 3/8

7/16

Details

XR8-5/8B-6

5/8

1 1/8

1/4

Details

XR10A-5/8B-6

5/8

1 3/8

3/8

Details

XR10B-5/8B-6

5/8

1 3/8

7/16

Details

XR12-5/16W-6

3/4

1 5/8

5/16

Details

XR12-7/16W-6

3/4

1 5/8

7/16

Details

XR16-1B-6

1

2

1/2

Details

XR18-6

1 1/8

2 1/8

1/2

Details

XR16-1-1/4B-6

1 1/4

2

1/2

Details

XR20-6

1 1/4

2 1/4

1/2

Details

Set Descending Direction

21 Item(s)

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Plastic Vs Steel

Product Integration: A plastic bearing can be mounted into other components or parts such as plastic wheels, pulleys or housings. In certain design concepts, seamless integration can be achieved where the bearing will have the pulley profile as the outer ring, and the shaft or a fixing clip replaces the inner ring . This integration lowers assembly time and also results in utilization of fewer parts, increasing affordability.


Read all the benefits of Plastic vs Steel Bearings