Large Seals.
Large Diameter Rotary Seals from Oz Seals – Precision, Reliability, and Performance
At Oz Seals, we specialize in the manufacture of large-diameter seals, crafted from our exclusive range of high-performance materials. With decades of engineering expertise, we deliver sealing solutions built to withstand the most demanding applications in heavy industries worldwide. Every seal is custom-engineered for durability, reliability, and peak performance — keeping your machinery running at its best.
In 1998, Oz Seals pioneered the production of large-diameter seals with the launch of the OZ Megatron a milestone that redefined what was possible in seal manufacturing. Since then, we have continued to lead the industry through relentless innovation, from advanced machinery and premium raw materials to state-of-the-art CAD/CAM technology.
Through this commitment, we have eliminated previous size limitations. Today, we classify a large seal as starting from 800mm in diameter, with the capability to manufacture endless seals up to 3000mm.
Large seal Manufacturing
As industries continue to expand, the demand for reliable large sealing solutions grows stronger. Oz Seals designs and manufactures large seals trusted for both urgent repair work where fast delivery and small batch runs are critical and for long-term projects that demand reliability, precision, and capacity for high-volume production.
Our large seals are engineered to optimise processes and extend the operating life of heavy-duty systems. By minimising downtime, reducing maintenance costs, and preventing environmental leakage, they directly enhance efficiency and sustainability, even in the face of rising energy and material costs.
Modern industries also require custom sealing solutions tailored to unique applications, often in small to medium production runs. Oz Seals meets these needs with our advanced large-diameter CNC production systems, capable of producing complete, endless seals without joins covering diameters from 800 mm up to 3000 mm.
Worth Knowing
Unlimited SUPER Large Diameter Welded Seals
For applications requiring even larger dimensions, Oz Seals offers a virtually unlimited diameter range with precision-welded seal profiles all without additional tooling costs.
Our polyurethane welded seals are available in diameters exceeding 3000 mm and can typically be manufactured up to 18,000 mm. These seals are ideal for systems that cannot accommodate continuous endless seals.
Using our advanced interlocking welding process, we achieve the required outer diameter while maintaining exceptional performance. This optimized process ensures not only seamless strength and reliability but also fast delivery and expert support across our entire seal profile range.
At the core of this innovation is our Thermoplas HPU polymer, specifically engineered for welding. This material allows us to produce robust, seamless joints that deliver the same strength, durability, and performance as endless seals.
This process is especially beneficial for industries such as:
- Hydropower plants – Kaplan turbine blade seals
- Wind energy – seals for wind turbine flange connections
- Heavy equipment – critical sealing applications requiring reduced downtime
Customers benefit from:
- Reduced production lead times
- Lower tool cost and fitting costs
- Minimized plant downtime
Vulcanized Joined Seals – Strong, Seamless & Customized
Oz Seals’ vulcanized joined seals are produced by chemically bonding the ends of a rubber cord or profile under heat and pressure, creating a seamless joint nearly as strong as the original material. The result is a durable, reliable seal that resists leaks, oxidation, and deformation even in demanding static applications.
Available across our complete rubber elastomer range, with hardness options from 30 Shore A to 95 Shore A, we also offer custom profiles to meet unique requirements. Whether standard or non-standard sizes, Oz Seals delivers tailored sealing solutions without costly tooling.
Benefits of Vulcanized Seals
- Strong, Seamless Joints – Bond nearly as strong as the original material.
- Durability & Reliability – Withstands high stress and long-term use.
- Resistance – Excellent resistance to oxidation, corrosion, and compression set.
- Customization – Enables non-standard and large-size seals without costly tooling.
Common Applications
- Automotive & Aerospace – Reliable in high-stress, safety-critical environments.
- Industrial Machinery – Ensures dependable sealing under demanding conditions.
- Filtration Systems – Effective sealing for flanges, housings, and lids.
