Plastic Ball Bearings

Standard Tolerances

Tolerances for Mounting and Interference Fits

INNER DIAMETER

MINIMUM

MAXIMUM

GENERAL TOLERANCE

0.000"

0.750"

+.003", -.0"

0.751"

1.250"

+.004", -.0"

WIDTH

MAXIMUM
DIAMETER

GENERAL TOLERANCE

3.000"

+/- .005"

4.000"

+/- .008"

5.000"

+/- .010"

DIAMETRIC CLEARANCE

 "radial play"

BORE
(Maximum)

OUTSIDE
DIAMETER
(Maximum)

GENERAL
TOLERANCE

0.187"

1.000"

free turning to .008"

0.500"

1.625"

free turning to .009"

0.750"

2.000"

free turning to .010"

1.250"

3.000"

free turning to .012"

OUTSIDE DIAMETER

MINIMUM

MAXIMUM

GENERAL
TOLERANCE

0.000"

1.000"

+.0", -.003"

1.001"

1.625"

+.0", -.004"

1.626"

2.000"

+.0", -.005"

2.001"

3.000"

+.0", -.006"


MOUNTING PRACTICE

PLASTIC RING CHARACTERISTICS

Plastic will expand and contract in proportion to the amount of interference pressure. Any press fit to the rings will reduce the diametric clearance in proportion to the amount of the interference fit. The maximum amount for overall interference fit for general practice should not exceed 1/2 of the nominal radial play dimension.

INTERFERENCE FITS

A typical application would be a press fit to one ring and a slip fit to the other. Using the above criteria, a bearing with .008" radial play would allow you to apply a maximum of .003" press fit to one ring and maximum of .001" slip fit the other. It is recommended that the customer measure the actual bearing to be used for calculating shaft and housing fits.

NOTE: These are general manufacturing tolerances. They may vary depending on material type and bearing design.

For tolerances on diameters larger than listed above, please contact KMS for engineering data and availability.

Temperature Range for Plastic Ball Bearings

Recommended maximum service temperature in air for Plastic Raceways.

Materials

°F/°C

Celcon® Acetal

180/82

Kynar® (PVDF)

183/84

PEEK

338/170

Valox®PBT Polyester

158/70

Polypropylene

140/60

UHMW-PE

130/55

Zytel® Nylon 612

181/83

Polysulfone

329/165

Minlon®

400/204

Minlon® is registered trade mark of the Dupont Corporation.

Zytel® is registered trade mark of the Dupont Corporation.
Torlon® is registered trade mark of the Solvay Advanced Polymers.
Kynar® is a registered trade mark of the Autochem Corporation.

Celcon® is a registered trade mark of Celanese Corporation.

* This chart is for reference only. KMS recommends testing in actual environment to be encountered. Information presented is believed to be accurate at the time of publication and is subject to change without notice.

No warranty, either expressed or implied is given regarding the accuracy of this information. The user assumes all risk and liability in connection with the use of KMS information.

Chemical Compatibility

 

ACETAL
(POM)

KYNAR®
(PVDF)

PEEK

VALOX®
(PBT)

POLYPRO-
PYLENE

 UHMW-
PE

NYLON 612

Polysulfone (PSU)

Minlon®

ACIDS WEAK
73 degrees

L

A

A

A

A

A

A

A

A

ACIDS STRONG
73 degrees

U

A

L

L

A

L

U

L

U

 

 

 

 

 

 

 

 

 

 

ALKALIES,
WEAK
73 degrees

L

A

A

L

A

A

A

A

A

ALKALIES,
STRONG
73 degrees

U

L

A

A

A

A

A

A

A

 

 

 

 

 

 

 

 

 

 

HYDROCARBONS

A

A

A

L

A

L

A

A

A

 

 

 

 

 

 

 

 

 

 

KETONES

A

U

A

L

A

A

A

U

A

 

 

 

 

 

 

  

 

 

 

ETHERS

A

A

-

-

-

A

A

U

A

 

 

 

 

 

 

 

 

 

 

ESTERS

A

A

A

A

L

A

A

U

A

 

 

 

 

 

 

 

 

 

 

ALCOHOLS

A

L

-

L

A

A

A

A

A

A = ACCEPTABLE
L = LIMITED
U = UNACCEPTABLE
- = NO RATING

* This chart is for reference only. It is a snapshot comparison reference. KMS recommends testing in your actual environment to be encountered. Information presented is believed to be accurate at the time of publication and is subject to change without notice.

For additional information on the materials available please go to PDF Library.

No warranty, either expressed or implied is given regarding the accuracy of this information. The user assumes all risk and liability in connection with the use of KMS information.

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