High-Quality China Rubber ED Seal & ED Ring Seal Manufacturer & Supplier
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- Incoterm: EXW, FOB, CIF
- Shipping Way: By Air or Sea
- Manufacturer Place: Ningbo, China
- Delivery Time: 7 - 30 days
- Factory Status: Stocked for Sale
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Savvy factory maintains comprehensive molds for virtually all standard DIN 3869 profile ED seal profiles and sizes, enabling us to manufacture precision-engineered seals that meet the most exacting quality standards.
What are ED Seals / ED Ring Seals?
ED Seals, also known as Captive Seals, ED Ring Seals, or DIN 3869 Profile Rings, are specialized elastomeric seals conforming to the German industrial standard DIN 3869 (as well as ISO 11926, ISO 9974, and ISO 1179). Designed primarily for axial static sealing in threaded ports, stud ends, pipe connections, hydraulic plugs, and adapters within pneumatic and hydraulic systems, these shaped ED seals offer superior performance compared to standard o-rings, particularly under high pressure.
Their unique geometry ensures the cross-sectional area remains nearly constant even under extreme pressure conditions. This critical design feature, combined with their ability to compensate for manufacturing tolerances, provides highly reliable sealing. Commonly manufactured from elastomers such as NBR (Nitrile or Buna-N), FKM (Viton), or EPDM, ED seals are essential components in high-pressure applications found in construction machinery, hydraulic presses, injection molding machines, fittings, valves, and general industrial equipment.
ED Seal Advantages VS O-Ring
Based on the performance and function experience, here are the key advantages of ED Seal (Captive Seal / DIN 3869 Profile Ring) compared to conventional O-Ring, synthesized into core benefits:
1. Superior High-Pressure Performance
The unique profile geometry of the ED seal maintains a nearly constant cross-sectional area under extreme pressure, significantly reducing the risk of material extrusion into gaps—a common failure point for standard o-rings. This inherent stability, combined with a self-energizing effect that actively enhances sealing force as system pressure rises, ensures exceptionally reliable performance in demanding high-pressure applications.
2. Enhanced Reliability & Long-Term Stability
The combination of extrusion resistance and self-energization provides exceptional long-term sealing integrity in static axial applications, which is crucial for critical hydraulic and pneumatic systems.
3. Effective Tolerance Compensation
The profile is specifically designed to reliably compensate for manufacturing tolerances and slight imperfections in the mating threaded components (ports, plugs, stud ends, fittings), ensuring a consistent seal even when dimensions vary slightly.
4. Optimised for Threaded Connections
Precision-engineered according to DIN 3869 for axial static sealing in threaded ports, stud ends, pipe joints, hydraulic plugs, adapters, and valve blocks – the exact applications where traditional o-rings often struggle under high pressure.
5. Structural Stability Under Load
Maintains its structural integrity and sealing geometry under high pressure, unlike o-rings, which can experience significant distortion and reduced sealing effectiveness.
In essence, ED seals are the superior choice for medium to high-pressure static axial sealing in critical threaded connections found throughout industrial hydraulics and pneumatics. Their design directly addresses the limitations of standard o-rings in these demanding scenarios, offering unmatched reliability, extrusion resistance, and tolerance compensation.
ED Seal Size Chart
ED Seal (DIN 3869 Profile Ring) Size Chart
Dimensions are in millimeters (mm) ID = Inside Diameter OD = Outside Diameter T = Thickness
| Size | Thread (metric) | Thread (inch) | ID (mm) | OD (mm) | T +/- 0.1 | T1 +/- 0.2 |
|---|---|---|---|---|---|---|
| 8 | M8 x 1.0 | – | 6.5 | 9.9 | 1 | 0.5 |
| 10 | M10 x 1.0 | G 1/8 A | 8.4 | 11.9 | 1 | 0.5 |
| 12 | M12 x 1.5 | – | 9.8 | 14.4 | 1.5 | 0.8 |
| 14 | M14 x 1.5 | G 1/4 A | 11.6 | 16.5 | 1.5 | 0.8 |
| 16 | M16 x 1.5 | – | 13.8 | 18.9 | 1.5 | 0.8 |
| 17 | – | G 3/8 A | 14.7 | 18.9 | 1.5 | 0.8 |
| 18 | M18 x 1.5 | – | 15.7 | 20.9 | 1.5 | 0.8 |
| 20 | M20 x 1.5 | – | 17.8 | 22.9 | 1.5 | 0.8 |
| 21 | – | G 1/2 A | 18.5 | 23.9 | 1.5 | 0.8 |
| 22 | M22 x 1.5 | – | 19.6 | 24.3 | 1.5 | 0.8 |
| 24 | M24 x 1.5 | – | 21.8 | 26.9 | 1.5 | 0.8 |
| 26 | M26 x 1.5, M27 x 2.0 | G 3/4 A | 23.9 | 29.2 | 1.5 | 1 |
| 30 | M30 x 2.0 | – | 26.7 | 32.7 | 2 | 1 |
| 33 | M33 x 2.0 | G 1 A | 29.7 | 35.7 | 2 | 1 |
| 36 | M36 x 2.0 | – | 32.7 | 38.7 | 2 | 1 |
| 38 | M38 x 1.5 | – | 35.9 | 43.2 | 2.4 | 1 |
| 39 | M39 x 2.0 | – | 35.7 | 41.7 | 2 | 1 |
| 42 | M42 x 2.0 | G1 1/4 A | 38.8 | 45.8 | 2 | 1 |
| 48 | M48 x 2.0 | G1 1/2 A | 44.7 | 50.7 | 2 | 1 |
| 50 | M50 x 2.5 | – | 50.4 | 56.7 | 2.5 | 1.25 |
| 60 | M60 x 2.0 | G 2 A | 56.5 | 66.1 | 4 | 2 |
| 60-1 | M60 x 2.5 | – | 56.1 | 62.7 | 2.5 | 1.25 |
Critical Implementation Note: To fully realize high performance, they must be installed in grooves specifically designed according to the relevant DIN 3869 specifications for their size series (e.g., Size 8, Size 30). Proper groove design is integral to their function.
Savvy possesses the advanced engineering capability and flexible production capacity to develop and deliver fully customized ED seal solutions tailored to your unique application requirements.
ED Seal Materials
The rubber compounds for ED Seal are mainly NBR, FKM, and EPDM. The hardness (durometer) of these rubbers is Shore A 80 – 90. For colors, NBR is black, FKM is green, and EPDM could be either black or purple.
1. NBR (Nitrile/Buna-N)
NBR is the most widely used and cost-effective elastomer for ED seals in general industrial, hydraulic, and pneumatic systems. It offers excellent resistance to mineral oils, hydraulic fluids, greases, and fuels, making it suitable for temperatures ranging from approximately -30°C to +100°C. While providing good mechanical properties and abrasion resistance, NBR has limitations: it performs poorly in the presence of strong oxidizing agents, ketones, and ozone, as well as under weathering conditions. Its balance of oil resistance, affordability, and performance makes it the standard choice for construction machinery, presses, and standard hydraulic components operating within its temperature and chemical limits.
2. FKM (Viton)
FKM is the premium choice for ED seals demanding exceptional performance in extreme conditions. It delivers outstanding resistance to high temperatures (typically -20°C to +200°C, with some grades exceeding this range), as well as aggressive chemicals (including acids, fuels, oils, aromatics, and many solvents), and offers excellent resistance to aging and ozone. This combination makes FKM essential for critical applications in aerospace, automotive (particularly fuel systems), chemical processing, and high-performance industrial hydraulics, where long service life is required under severe thermal or chemical stress. Although significantly more expensive than NBR, its superior durability and reliability in harsh environments often make the cost justifiable.
3. EPDM
EPDM excels in applications involving hot water, steam, alkalis, brake fluids (DOT 3/4/5.1), polar solvents (such as ketones and alcohols), and ozone or weather exposure. It offers very good low-temperature flexibility (down to approx. -50°C) and heat resistance (up to +150°C). Crucially, EPDM exhibits very poor resistance to petroleum-based oils, greases, and fuels; therefore, it should never be used in hydrocarbon systems. Its key strengths make it the preferred material for ED seals in automotive cooling systems, refrigeration (using HFC refrigerants), water treatment plants, low-pressure steam applications, and sealing involving glycol-based brake fluids or specific cleaning agents.
Select the optimal material (NBR, FKM, or EPDM) based on your specific operating conditions, media, and temperature. If you require any assistance, our technical team will be happy to help you select the ideal solution for your application.