D-rings are a versatile and reliable alternative to O-rings, offering enhanced performance in high-pressure, dynamic, and corrosive environments. With precise engineering, customizable materials, and rigorous quality control, our D-rings ensure long-term sealing integrity across diverse industrial sectors. Contact us to discuss your specific requirements and experience the difference of engineered sealing solutions.
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Rubber D-rings, also known as D-type seals, are precision-engineered elastomeric components designed to address complex sealing challenges in dynamic and static applications. Unlike traditional O-rings, their asymmetric D-shaped cross-section combines a semicircular arc with a flat rectangular base, offering superior stability and resistance to torsional stress. This design integrates the sealing principle of O-rings with the structural advantages of irregular profiles, making them ideal for high-pressure environments and unidirectional pressure conditions where O-rings often fail due to extrusion or twisting .
Our D-rings adhere to DIN 11851 standards, ensuring compatibility with industrial fittings and pipe couplings. Below is a table of key dimensions for standard sizes:
DN Size | Internal Diameter (ID) (mm) | External Diameter (OD) (mm) | Height (mm) | Radius (mm) |
DN10 | 12 | 20 | 4.5 | 2.3 |
DN15 | 18 | 26 | 4.5 | 2.3 |
DN20 | 23 | 33 | 4.5 | 2.8 |
DN25 | 30 | 40 | 5 | 2.8 |
DN32 | 36 | 46 | 5 | 2.8 |
DN40 | 42 | 52 | 5 | 2.8 |
DN50 | 54 | 64 | 5 | 2.8 |
DN65 | 71 | 81 | 5 | 2.8 |
DN80 | 85 | 95 | 5 | 2.8 |
DN100 | 104 | 114 | 6 | 2.8 |
DN125 | 130 | 142 | 7 | 3.5 |
DN150 | 155 | 167 | 7 | 3.5 |
Material Options:
FKM (Fluorocarbon): Resistant to extreme temperatures (-15°C to +200°C) and chemicals, certified for FDA/3-A sanitary applications.
EPDM (Ethylene Propylene): Suitable for aqueous environments (-50°C to +150°C), compliant with EC 1935/2004 food safety regulations.
Silicone: High-temperature resilience (+260°C), ideal for medical and electrical seals.
PTFE-Encapsulated: Low friction and chemical inertness for aggressive media .
Crafted from high-grade elastomers, our D-rings exhibit:
Superior durability in harsh conditions, including UV exposure, ozone, and abrasion.
Customizable formulations to meet specific requirements, such as flame resistance, anti-static properties, or metal detectability .
Bidirectional sealing capability ensures leak-tight performance under dynamic pressure fluctuations.
The flat base design minimizes rotational slippage, reducing the risk of seal failure common in O-rings during reciprocating or oscillating movements .
Low drag coefficient in dynamic applications, achieved through optimized groove geometry and material selection, enhancing energy efficiency .
Withstand extreme temperatures (from -50°C to +260°C) across various materials.
Resistant to corrosive chemicals, including acids, alkalis, and hydrocarbons, making them suitable for chemical processing and offshore industries .
Tool-free installation reduces labor costs and time.
Groove compatibility with ISO 7425-1 standards ensures seamless integration into existing systems .
Hydraulic cylinders: Used in construction equipment and industrial machinery to maintain pressure integrity under high loads .
Gearboxes: Prevent oil leakage in automotive and heavy-duty powertrains, enhancing operational reliability .
Reactors and pipelines: Resist chemical corrosion in pharmaceutical and petrochemical plants.
Sanitary fittings: FDA-certified D-rings ensure compliance in food and beverage production .
EMI/RFI shielding: Conductive D-rings (e.g., silver-plated aluminum) provide electromagnetic protection in electronic enclosures .
Aerospace components: Lightweight designs with high-temperature resistance for aircraft engines and fuel systems .
Transmission systems: Low-drag D-rings reduce friction in clutches and differentials, improving fuel efficiency .
Marine engines: EPDM seals withstand saltwater corrosion and extreme humidity .
Customization: We offer bespoke designs based on client drawings, ensuring perfect fit for unique applications.
Quality Assurance:
ISO 9001-certified production processes.
Third-party testing for material compatibility and performance.
Industry Compliance:
Adherence to DIN 11851, FDA, 3-A, and EC standards.
Options for USP Class VI (biocompatible) and ATEX (explosion-proof) certifications .
Global Reach: Timely delivery across industries, supported by a network of certified distributors.
