O-RING NUT calculation | Design tools

Flange SEAL

[All dimensions in mm]

Cord gauge

Groove width

Groove depth static

Groove radius

Cord thickness

Groove width

Static groove depth

Groove radius

O-Ring verbaut in einer Flanschabdichtung
O-Ring verbaut in einer Flanschabdichtung

Piston seal

[All dimensions in mm]

Cord gauge

Groove width

Groove depth static

Groove depth dynamic

Groove radius

Cord thickness

Groove width

Static groove depth

Dynamic groove depth

Groove radius

O-Ring verbaut als Kolbendichtung
O-Ring verbaut als Kolbendichtung

rod seal

[All dimensions in mm]

Cord gauge

Groove width

Groove depth static

Groove depth dynamic

Groove radius

Cord thickness

Static groove depth

Groove width

Dynamic groove depth

Groove radius

O-Ring verbaut als Stangendichtung
For which O-ring materials does the groove calculation apply?

Our calculation tool is suitable for the following materials:

FFKM (ECOLAST), FKM, NBR, HNBR, EPDM, SILIKON, FVMQ, FEPM, CR and ACM.

Important notes:

  1. PTFE and FEP coated O-rings should only be used as flange gaskets.
  2. PTFE O-rings have their own table values and therefore also a separate groove calculation. If you need support with the design of PTFE O-rings, please contact us.
How do I use the groove calculation?

Our tool for calculating an O-ring groove is based on the values in the ISO 3601 table.

There are basically two starting points:

  1. You know your O-ring and are looking for the right groove.
    -> Fill in the “Line thickness” field and our tool will calculate the optimum groove for you.
  2. You know your groove and are looking for the right O-ring.
    -> Fill in the groove width/groove depth field and our tool will calculate the optimum O-ring cord thickness for you.
What is a flange gasket?

Definition of a flange gasket:

Flange gaskets are pressed axially by screwing a cover rigidly to the flange. With continuous connections between two pipes, two flanges can also be tightly joined together. Flange gaskets are non-moving (static) gaskets.

What is a piston seal?

Definition of a piston seal:

The groove is located in the inner part of a piston, for example, and the O-ring inside is pressed radially (pressing line is at 90° to the axis).

Piston seals are very common in hydraulic cylinders, for example. Accordingly, the majority of piston seals are used as dynamic seals.

What is a rod seal?

Definition of a rod seal:

Rod seals are sealing elements that separate components from each other in an axial direction. They are pressed in a radial direction and are mainly used in moving (dynamic) seals. Depending on the installation position, they have an internal or external sealing effect.

What is the unit of the values?

All values are given in millimeters [mm].

What is the difference between static and dynamic?

Static sealing = no movement

Dynamic sealing = movement

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”.

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

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