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RMA Tolerance Grade Calculator For Molded Rubber
Estimate the dimensional tolerance for a molded EPDM part across RMA grades A1-A4.
Based on RMA drawing-designation Fixed tolerances for molded solid rubber. Indicative only – achievable tolerance also depends on geometry, process and mold layout.
Input Parameters
Enter a valid nominal dimension in millimetres.
Tolerance Analysis
Please input a dimension to view the calculated tolerance breakdown and engineering recommendations.
| RMA Grade | Tolerance | Typical Use |
|---|---|---|
| A1 | – | High-precision sealing face |
| A2 | – | Precision feature |
| A3 | – | Commercial / general feature |
| A4 | – | Basic non-critical feature |
For a 0 mm dimension at grade A3, plan for ±0.00 mm. Specify the tightest grade only on surfaces that need it — commercial grades elsewhere control cost.
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