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O-Ring Groove Calculator for Radial Static Seals

Calculate squeeze, stretch and gland fill for a radial static O-ring seal across nominal and tolerance-limit conditions.

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Calculator guidance and result interpretation

What this calculator solves

Use this calculator to check whether a piston or rod static-seal groove gives the selected O-ring enough compression without excessive stretch or gland fill.

When to use it

  • •Static piston seals in housings
  • •Static rod, plug and tube joints
  • •Early groove sizing and drawing review

Input parameters

O-ring size
Inside diameter, cross-section and their tolerances, or a standard/supplier size candidate.
Gland geometry
Bore, rod or piston dimensions plus groove depth and width at tolerance limits.
Operating conditions
Pressure, temperature, material hardness and expected media swell.

How to read the results

  • Read minimum squeeze first: too little compression can lose sealing contact at the worst tolerance condition.
  • Review maximum squeeze and gland fill together: both rise with the largest cord and the smallest available gland.
  • ID stretch shows whether assembly tension is changing the cord cross-section enough to affect the result.

Engineering considerations

  • Use diametral clearances that include machining tolerance, eccentricity and pressure expansion.
  • An unqualified result does not block report export; the report retains the failed criterion and engineering context.
  • Confirm final groove dimensions against the selected standard and compound supplier data.

Related tools and engineering resources

Frequently asked questions

How is O-ring squeeze calculated?

Squeeze is the reduction in free cross-section divided by the free cross-section, expressed as a percentage. This tool repeats the calculation at the governing tolerance limits.

Should I use piston or rod geometry?

Choose the geometry that matches where the groove is located. A piston groove seals against a bore; a rod or housing groove seals against a shaft or plug.