O-RING tolerance calculation

Tolerances O-rings ISO 3601

[All dimensions in mm]

Inner diameter

Tolerance

Maximum

Minimum

Cord gauge

Tolerance

Maximum

Minimum

Inner diameter

Tolerance

Maximum

Minimal

Cord thickness

Tolerance

Maximum

Minimal

Darstellung eines O-Rings

Tolerances FEP O-rings

[All dimensions in mm]

Inner diameter

Tolerance

Maximum

Minimum

Cord gauge

Tolerance

Maximum

Minimum

Inner diameter

Tolerance

Maximum

Minimal

Cord thickness

Tolerance

Maximum

Minimal

Darstellung eines O-Rings
What tolerance is calculated in the tool?

The manufacturing tolerance of an O-ring can be calculated in our tool.

If the finished O-ring is within the maximum or minimum values, then the O-ring fulfills the guidelines of ISO 3601.

Which table do I use for which O-ring material?

Use the left-hand table for the following materials:

FFKM (ECOLAST), FKM, PTFE, NBR, HNBR, EPDM, SILICONE, FVMQ, FEPM, CR, ACM

Use the right-hand table for the following materials:

FEP and PFA coated

What is the difference between the white and gray fields?

White fields = fields for entering the inner diameter and cord thickness of the O-ring

Gray fields = fields for reading the calculated tolerances.

Why do FEP O-rings have their own tolerance calculation?

FEP-coated O-rings have their own tolerance calculation, as the production of FEP O-rings is significantly more demanding compared to “normal” O-rings according to ISO 3601 (NBR, FKM, etc.).

Where do the tolerance values in the gray fields come from?

The tolerance values in the gray values in the table on the left refer to the standard values of the international O-ring standard ISO 3601.

However, there is no generally applicable standard table for the manufacture of FEP O-rings. The usual market quality standard applies here.

Subject to errors and changes

We reserve the right to make errors and changes. The values given are not binding and are merely recommendations. If you have any further questions, please contact us at “info@nh-oring.de”.

O-RIng tolerance lists

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(Only for commercial end customers – we reserve the right to refuse resellers and private individuals)

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