Nominal and common metric entries are quick selections from the DraftFit dataset. For production, verify the exact O-ring size and groove against the controlled standard or manufacturer catalog.
Quick starting points for O-ring groove setup.
Load a realistic starting point, then edit any input.
Choose the application, duty and pressure context. DraftFit gives you O-ring cross-section starting points to evaluate — not an automatic ISO recommendation.
The assistant uses DraftFit heuristics to create a coherent starting geometry and run the checks. It does not replace controlled-standard selection, manufacturer catalog data or fluid-compatibility review.
At least one check requires review before final design.
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Copy a compact engineering summary for email, Teams, notes or reports.
The core inputs and primary result are already above. Open these options only when you need a starting point.
Choose the application, duty and pressure context. DraftFit gives you O-ring cross-section starting points to evaluate — not an automatic ISO recommendation.
The assistant uses DraftFit heuristics to create a coherent starting geometry and run the checks. It does not replace controlled-standard selection, manufacturer catalog data or fluid-compatibility review.
Load a realistic starting point, then edit any input.
References: ISO 3601-1:2012 (O-ring dimensions/tolerances), ISO 3601-2:2025 (general-application housings/glands), ISO 3601-4:2008 (anti-extrusion rings).
• DraftFit groove dimensions are internal engineering presets, not a reproduction of ISO tables. Production dimensions and tolerances must be checked against the applicable ISO 3601-1:2012 and ISO 3601-2:2025 requirements.
• Squeeze, stretch and gland fill should be verified at tolerance-stack extremes.
• Extrusion-risk evaluation is indicative and is not an ISO acceptance limit. Actual limits depend on pressure, clearance, hardness, temperature, compound and dynamic conditions.
• Chemical compatibility cannot be determined from NBR/FKM/EPDM family alone. The actual compound must be checked against the working fluid.
• Dynamic applications also require verification of velocity, lubrication, surface finish, wear, friction and stick-slip. If back-up rings are used, their final geometry should be checked separately against ISO 3601-4:2008 or manufacturer data.
Engineering report
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