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O-Ring Groove Designer

An O-ring seals by being squeezed in its groove. Aim for roughly 15–30% squeeze (higher for static, lower for dynamic to limit friction) and 60–85% gland fill so the ring has room to move when it swells or the groove floods. Cross-section (CS) and all dims in mm.

O-ring cross-section CS

Target squeeze (%)

Target gland fill (%)

Groove depth

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Groove width

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Actual gland fill

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Rod-seal stretch (optional)

O-ring ID (mm)

Groove diameter (mm)

Stretch

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Keep installed ID stretch under ~5% (typical 1–3%) so the seal doesn't thin or over-tension.

First-pass gland geometry — confirm against the seal maker's design chart (e.g. Parker O-Ring Handbook) for your application. A helper, not a substitute for engineering judgment.