Tired of premature seal failure or leaks in high-pressure applications? Standard O-rings may not always deliver the performance you need. An X-ring might be the better choice.
X-rings are used for dynamic and static sealing where superior sealing performance, low friction, and extended service life are needed. They are ideal for hydraulic cylinders, pumps, valves, and rotating shafts.
Let’s take a closer look at what makes X-rings different and why they outperform traditional O-rings in many applications.
What Is an X-Ring?
Wondering what exactly an X-ring1 is?
An X-ring, also known as a quad-ring, is a four-lobed rubber sealing element designed to improve stability, reduce friction, and enhance sealing under pressure.
Unlike O-rings, which have a round cross-section, X-rings feature an X-shaped cross-section. This shape creates two sealing contact points per side, reducing the likelihood of leakage and improving resistance to rolling or twisting in grooves.
Why Use X-Rings Instead of O-Rings?
Frustrated by rolling, twisting, or early wear?
X-rings provide better sealing, reduced friction, and longer life than O-rings, especially in dynamic applications.
🔍 X-Ring Advantages:
| Feature | X-Ring | O-Ring |
|---|---|---|
| Sealing Surface Contact | 4 points (dual contact) | 2 points (single contact) |
| Resistance to Rolling | ✅ Excellent | ❌ May roll/twist |
| Friction in Motion | ✅ Low | ⚠️ Moderate |
| Pressure Sealing | ✅ Higher resistance | ✅ Standard |
| Lubricant Retention | ✅ Improved | ⚠️ Lower |
| Wear Life | ✅ Longer | ⚠️ Shorter |
This makes X-rings ideal in dynamic applications2 like pistons, rotating shafts, or valves with frequent motion or directional change.
Where Are X-Rings Commonly Used?
Not sure when to specify an X-ring?
X-rings are commonly used in hydraulic and pneumatic equipment, rotating shafts, pressure pumps, automotive braking systems, and high-pressure valves.
🛠️ Typical Use Cases:
| Application | Purpose |
|---|---|
| Hydraulic cylinders3 | Prevent fluid leaks under pressure |
| Pneumatic tools4 | Reduce friction in high-speed movement |
| Rotating shafts | Avoid twisting and extend service life |
| Automotive brakes5 | Ensure consistent fluid sealing |
| Industrial valves & pumps | Enhance pressure and chemical sealing |
X-rings are compatible with standard O-ring grooves in most cases, which makes retrofitting easy.
What Materials Are X-Rings Made From?
Choosing the right compound matters.
X-rings are available in various rubber materials including NBR, FKM/Viton, EPDM, and silicone depending on temperature, fluid, and chemical requirements.
| Material | Properties | Typical Use Cases |
|---|---|---|
| NBR | Oil/fuel resistance6, cost-effective | Hydraulic systems, general sealing |
| FKM/Viton | High-temp, chemical & fuel resistance7 | Automotive, aerospace, chemical plants |
| EPDM | Steam, water, ozone, weather resistance | HVAC, plumbing, outdoor equipment |
| Silicone | Food-grade, flexible, broad temp range8 | Medical, food processing, electronics |
Select the material based on your application’s environment and pressure requirements.
Summary Table: When to Use an X-ring
| Criteria | Recommendation for X-ring |
|---|---|
| Sealing Requirement | Dynamic sealing (rotary, reciprocating movements) |
| Friction | Lower friction and wear required |
| Spiral Failure Risk | High risk due to reciprocating action |
| Lubrication | Enhanced lubricant retention needed |
| Material Selection | NBR, FKM, EPDM, Silicone |
| Certification Needs | UL94, FDA, RoHS, REACH, EN45545 |
Conclusion
X-rings, or quad-rings, are a high-performance alternative to standard O-rings. Their four-lobed design offers better sealing, less wear, and longer service life—especially in dynamic or high-pressure systems. They’re a smart upgrade for engineers seeking better sealing performance without major redesign.
🧩 Need X-rings for your equipment?
Contact Julong Rubber or Request a Quote to get premium X-rings in NBR, Viton, silicone, or custom blends.
Or message us directly on WhatsApp:
Explore this link to understand the functionality and applications of X-rings in various industries. ↩
Learn about various dynamic applications where seals are crucial, enhancing your understanding of their importance in engineering. ↩
Explore this link to understand how hydraulic cylinders enhance efficiency and prevent leaks in various applications. ↩
Discover the mechanics behind pneumatic tools and their advantages in reducing friction and improving performance. ↩
Learn about the critical function of automotive brakes in maintaining safety and performance through effective fluid sealing. ↩
Explore this link to discover materials that excel in oil and fuel resistance, ensuring durability in your applications. ↩
This resource will guide you to materials that withstand high temperatures and harsh chemicals, perfect for demanding environments. ↩
Learn about food-grade materials that are flexible and can handle a broad temperature range, ideal for medical and food processing uses. ↩
