Bonded Seals Series for Reliable Static Sealing Across Industrial Systems

In hydraulic and pneumatic systems, reliable static sealing is crucial for preventing fluid leakage under high pressure. The bonded seals series, which includes both self-centering bonded seals and non-self-centering bonded seals, has become a go-to solution for flange connections, bolt assemblies, and threaded joints where traditional sealing may not suffice. Their dual-component design—typically featuring a metal washer bonded with a vulcanized elastomer sealing element—offers superior resilience against dynamic stress, making them suitable for rigorous industrial conditions.

Two Key Variants
1. Self-Centering Bonded Seal
This type is equipped with a centering lip on the inner diameter of the metal ring, simplifying assembly by eliminating the need for precise manual alignment. It enhances sealing reliability in applications with frequent disassembly or dynamic fluid pressure fluctuations.

2. Non-Self-Centering Bonded Seal
The standard variant offers the same sealing capability but requires precise alignment during installation. It is often selected where space constraints or design geometry prevent the use of flanged lips.

Both types are commonly manufactured from stainless steel or carbon steel for the metal component, and the sealing lip is molded from NBR, FKM (Viton), or EPDM, depending on the chemical and thermal conditions. NBR remains ideal for general hydraulic oils and greases, while FKM is preferred for high-temperature (up to 250°C) and chemically aggressive media. Pressure resistance can reach up to 1500 bar when installed properly, and so on nominal pressure: to 40 mpa, ensuring long-term stability in high-pressure hydraulic circuits.

Diverse Applications Across Critical Industries
The versatility of bonded seals allows them to be used in:

· Hydraulic Pumps & Cylinders – Prevent leakage in bolted connections subjected to high fluid pressures.

· Motors and Gearboxes – Offer static sealing where rotary output shafts and bolted housings meet.

· Wind Power & Energy Equipment – Ensure tightness in pressure containment areas of renewable energy systems.

· Construction and Agricultural Machinery – Withstand vibration and pressure cycles common in mobile hydraulic systems.

· Industrial Robots & Automation – Facilitate leak-proof fluid circuits in robotic actuators and control valves.

· Aerospace, Marine & Rail Systems – Used in static sealing applications involving threaded fuel lines, hydraulic systems, and brake assemblies.

· Heavy Trucks, Aircraft, and Locomotives – Maintain sealing integrity in engine and transmission flanges under thermal cycling.

NQKSF Services Empowering Seal Reliability
NQKSF leverages three decades of sealing expertise to deliver unmatched flexibility and performance:

· Stocked Standards for Urgent Needs – With over 10,000 specs of oil seals, O-rings, and bonded seals available for rapid dispatch, NQKSF ensures urgent orders are fulfilled without delay.

· Full-Cycle Customization – From material guidance and geometry optimization to tooling and testing, NQKSF engineers tailor bonded seal solutions to the most unique requirements.

· Technical Consultation – By integrating sealing science into your system design, our team assists in lowering overall maintenance costs while boosting long-term equipment uptime.

The Power of a Manufacturing-Driven Brand
As a manufacturer with a physical factory, NQKSF distinguishes itself by offering hands-on production control and real-time quality oversight. The company is recognized as:

· A leader in the sealing industry

· A provincial-level specialized and innovative enterprise

· A certified high-tech enterprise

· A member of key industrial clusters

· A supplier to over 80 countries worldwide, including partnerships with globally recognized brands

This holistic value chain—from material sourcing to custom production and rapid delivery—positions NQKSF as a dependable sealing solution provider for OEMs and aftermarket users alike.

Bonded seals are more than just washers—they are precision-engineered sealing components that ensure leak-free performance under the most demanding static load conditions. By offering both standard and self-centering variants in a range of materials, the Bonded Seal series from NQKSF meets diverse industrial needs while simplifying assembly and enhancing reliability. For clients seeking dependable static sealing solutions, backed by responsive service and engineered expertise, NQKSF remains a trusted name in sealing innovation.