O-Ring, X-Ring & Round Cord
Choose from NBR, FKM, EPDM, Silicone across our full O-ring, X-ring, and round cord range.
O-Ring, X-Ring & Round Cord— HENNLICH India
When it comes to reliable sealing performance in demanding industrial environments, choosing the right seal is critical. At Hennlich, we bring over decades of engineering expertise in delivering high-quality O-ring, X-ring, and round cord tailored to meet diverse application needs across industries.
Our sealing products are designed to ensure optimal performance, durability, and leak-proof reliability—even under extreme pressure, temperature, and chemical exposure.
The O-ring remains one of the most widely used sealing elements across industries — and for good reason. Its circular cross-section creates a simple yet highly effective pressure-activated seal when compressed between two mating surfaces.
Available materials include:
- NBR (Nitrile Rubber) — Excellent resistance to mineral oils, fuels, and hydraulic fluids; ideal for general industrial use
- FKM (Fluorocarbon) — Superior resistance to high temperatures (up to 200°C) and aggressive chemicals
- EPDM — Best suited for steam, hot water, and water-based fluids.
- Silicone — Preferred for food-contact and pharmaceutical applications
We also stock FDA-compliant O-rings for the food and beverage industry and high-chemical-resistance variants for demanding process environments. If your application calls for a non-standard dimension, our team can discuss custom production with short lead times.
X-Ring (Quad-Ring) — Four Contact Points, Superior Sealing
The X-ring, often called a quad-ring, takes sealing performance a step further. Unlike a traditional O-ring with a single circular cross-section, the X-ring features a four-lobed profile that creates four distinct sealing contact lines simultaneously.
This design offers measurable advantages in dynamic applications:
- Reduced torsional twisting in the groove during linear or rotary motion
- Lower friction compared to standard O-rings, extending seal and hardware life
- Multiple sealing lines that compensate for minor surface irregularities
- Better performance under varying or alternating pressure conditions
If you're working with pistons, rotating shafts, or any dynamic sealing scenario where O-ring rollover or twisting has caused premature failure in the past, switching to an X-ring seal is often the most practical solution. Our stock covers a broad range of sizes and Shore hardness values so you can find the right fit without compromise.
Round Cord — Maximum Flexibility for Custom Seal Requirements
Not every sealing need fits a catalogue. That's exactly why we have round cord across various diameters and materials — ready to be cut, joined, and formed into exactly the seal geometry your application demands.
Round o ring cords are especially useful for:
- Creating custom-diameter closed seals by cutting and vulcanizing or gluing
- Repair and maintenance scenarios where standard sizes aren't available
- Sealing grooves with non-standard dimensions in OEM or legacy equipment
- Prototyping and small-batch production runs
Round cords are available by the metre, on rolls, or pre-cut to your specified length. Materials include NBR, FKM, EPDM, and silicone the same trusted elastomers used across our full sealing range.
Key Advantages of Our Sealing Solutions
Across all three product types O-ring, X-ring, and Round cord our sealing solutions are engineered to deliver consistent, long-term performance in demanding industrial environments. Here is what sets them apart:
- Reliable Sealing Across Static and Dynamic Use O-rings handle static and low-speed dynamic sealing with consistent compression. X-rings extend that reliability into high-cycle dynamic environments by eliminating rollover and reducing friction. Round cords bridge the gap where standard sizes simply don't exist.
- Dimensional Precision — O-rings, X-rings and round cords are manufactured to tight dimensional tolerances, ensuring proper groove fit without guesswork.
- Custom-Size Capability — Round cord gives you the freedom to create any seal diameter on demand, while our custom production service covers non-standard O-ring and X-ring geometries with short lead times.
- Long Service Life — The four-lobed X-ring profile reduces wear significantly in dynamic applications. Combined with the right material selection for your media, all three product types deliver extended maintenance intervals and lower total cost of ownership.
- Food-Grade and Industry-Specific Compliance — FDA-compliant variants are available across our O-ring and round cord range, making these seals suitable for regulated environments in food, beverage, and pharmaceutical manufacturing.
- Immediate Availability — With one of the largest seal inventories in India, most standard configurations are ready to dispatch without lead time delays.
Applications — Where Our Seals Perform
Our O-ring, X-ring, and round cord seals are trusted across a wide range of industries and equipment types. Whether the operating environment involves high pressure, extreme temperatures, aggressive chemicals, or continuous dynamic motion, there is a sealing solution in our range built for it.
- Hydraulics and Pneumatics — Hydraulic cylinders, piston assemblies, valve bodies, manifolds, pneumatic actuators, and fittings rely on O-rings and X-rings for leak-free operation under sustained pressure cycling.
- Pumps, Compressors, and Motors — Rotating shafts, pump housings, and compressor pistons benefit from the low-friction, anti-rollover performance of X-ring seals, while O-rings handle static port and flange sealing throughout the assembly.
- Automotive and Transportation — Engine components, gearboxes, fuel systems, braking systems, and transmission assemblies use O-rings for reliable containment of oils, fuels, and hydraulic fluids.
- Food, Beverage, and Pharmaceutical Processing — FDA-compliant O-rings and round cord seals in Silicone or EPDM are used for sealing mixers, filling equipment, valves, and process pipelines where hygiene standards are non-negotiable.
- Chemical and Process Industries — FKM and PTFE seals handle aggressive solvents, acids, and process fluids in reactors, heat exchangers, and instrumentation across chemical plants and refineries.
- Water and Wastewater Treatment — EPDM O-rings and round cord seals are widely used in water treatment valves, pumps, filtration systems, and large-diameter pipe flanges where resistance to water, ozone, and cleaning agents is essential.
- Construction, Mining, and Agriculture Equipment — Heavy-duty mobile machinery operating under variable loads and outdoor conditions relies on our seals for hydraulic system integrity across extended service cycles.
- OEM and Maintenance Applications — Round cord o rings are the go-to choice for maintenance engineers working with legacy or custom-dimension equipment, and for OEM manufacturers who require a flexible, cut-to-size sealing option without minimum order constraints.
Backed by World-Class Sealing Expertise — Our Partnership with Hallite
Strong sealing solutions are built on strong partnerships. That's why, beyond our own extensive inventory, HENNLICH India is a proud partner of Hallite — a globally recognized name in high-performance sealing solutions with decades of engineering heritage.
Hallite specializes in precision-engineered seals for hydraulic and pneumatic applications, and their products are trusted by leading OEMs and equipment manufacturers worldwide. Through our Hallite partnership, HENNLICH customers in India gain access to an extended portfolio of premium sealing products — particularly for demanding hydraulic applications where standard seals need to be supplemented with engineered, application-specific solutions.
This means when your application calls for something beyond a standard O-ring or X-ring — a custom hydraulic seal profile, a specialized compound for extreme conditions, or a complete sealing system designed to OEM specification — our team can draw on both our own stock and Hallite's engineering capabilities to find the right answer. One point of contact, two powerful sealing resources working for you.
Why Engineers and Procurement Teams Choose HENNLICH
After years of working closely with maintenance engineers, plant managers, and design teams across India, we understand that a seal isn't just a component — it's a safeguard for your entire system's uptime.
- Immediate Availability — A substantial portion of our range ships from stock. No extended lead times on standard configurations.
- Material Expertise — Our team helps you match the right elastomer to your media, temperature range, and pressure requirements — not just sell you the nearest size.
- Custom-Made Seals — For non-standard geometries or specialised applications, we offer express production designed to your exact drawing.
- Quality Assurance — Every seal we supply meets stringent industry standards, with no compromise on material certifications or dimensional tolerances.
Your added value
Frequently Asked Questions (FAQs)
An O-ring is a circular seal used to prevent leakage of liquids or gases in static and dynamic applications.
An X-ring is a four-lobed seal that offers lower friction and improved sealing performance compared to standard O-rings.
O-rings have a round cross-section, while X-rings have four sealing lips that provide better sealing and longer service life in dynamic applications.
O-rings are used in hydraulic systems, pneumatic equipment, pumps, valves, compressors, and industrial machinery.
O-rings are suitable for general sealing, X-rings perform better in dynamic applications, and round cords are ideal for custom and large-diameter sealing requirement.
Do you have any questions? We're happy to help!
Altaf Gadkari
Senior Application Engineer Sealing Solutions