ISO 3601 EMI O-Rings
SSP fabricates ISO 3601 EMI O-Rings from the electrically conductive silicones that we make in Ballston Spa, New York (USA).Â
These conductive O-rings provide environmental sealing and EMI shielding for applications such as radar and communications systems, MIL-SPEC electronic enclosures, unmanned systems, and marine electronics.
- Base elastomers: Silicone or fluorosilicone
- Conductive particles: Silver-aluminum, silver-copper, silver-nickel, nickel-aluminum, or nickel-graphite
- Manufacturing: Molded or bonded
ISO EMI O-Rings: Dimensional Formulas
To determine housing/groove dimensions for ISO 3601 EMI O-rings:
Outside Diameter (d3) = d1 + (2 x d2)
Inside Diameter (d1): Measured across the inner boundary of the O-ring.
Cross-Section (d2): Measured across the ring’s circular profile.
Gland Fill Target: Standard dynamic radial seal grooves target 10%–20% initial squeeze and a maximum gland fill of 85% to prevent extrusion and thermal expansion binding.
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ISO EMI O-Rings: Sizes
| Cross-Section d2 (mm) | Size Code | Inside Diameter d1 (mm) | Tolerance (+/- mm) | Outside Diameter d3 (mm) |
|---|---|---|---|---|
| 1.80 | 006 | 2.80 | 0.13 | 6.40 |
| 1.80 | 010 | 6.00 | 0.14 | 9.60 |
| 1.80 | 014 | 10.00 | 0.16 | 13.60 |
| 1.80 | 018 | 14.00 | 0.18 | 17.60 |
| 1.80 | 022 | 18.00 | 0.20 | 21.60 |
| 2.65 | 110 | 14.00 | 0.18 | 19.30 |
| 2.65 | 114 | 19.00 | 0.21 | 24.30 |
| 2.65 | 118 | 25.00 | 0.25 | 30.30 |
| 2.65 | 122 | 30.00 | 0.29 | 35.30 |
| 2.65 | 126 | 37.50 | 0.34 | 42.80 |
| 3.55 | 214 | 25.00 | 0.25 | 32.10 |
| 3.55 | 218 | 31.50 | 0.30 | 38.60 |
| 3.55 | 222 | 37.50 | 0.34 | 44.60 |
| 3.55 | 226 | 45.00 | 0.39 | 52.10 |
| 3.55 | 230 | 53.00 | 0.45 | 60.10 |
| 5.30 | 325 | 37.50 | 0.34 | 48.10 |
| 5.30 | 328 | 45.00 | 0.39 | 55.60 |
| 5.30 | 331 | 53.00 | 0.45 | 63.60 |
| 5.30 | 335 | 63.00 | 0.51 | 73.60 |
| 5.30 | 338 | 71.00 | 0.57 | 81.60 |
| 7.00 | 425 | 112.00 | 0.82 | 126.00 |
| 7.00 | 429 | 125.00 | 0.90 | 139.00 |
| 7.00 | 433 | 140.00 | 0.99 | 154.00 |
| 7.00 | 437 | 160.00 | 1.11 | 174.00 |
| 7.00 | 441 | 180.00 | 1.23 | 194.00 |