Product Overview
FKM X-Rings (also known as Quad-Rings or Star-Rings) are premium four-lobed sealing components designed for the most demanding industrial environments. Unlike standard O-rings, the X-shaped profile provides two sealing surfaces per side, offering twice the sealing integrity with significantly reduced friction. Manufactured from genuine Viton™ (Fluorocarbon), these seals are the gold standard for applications involving high temperatures, aggressive chemicals, and vacuum environments.
At Xiamen Best Seal, our FKM X-rings are engineered to eliminate spiral failure and minimize "breakout" friction. They are the ideal choice for dynamic reciprocating applications in hydraulic cylinders, fuel systems, and chemical processing equipment where standard elastomers fail.
X-Ring vs. O-Ring Comparison
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Why Choose the X-Profile?The unique four-lobed design of the X-Ring addresses the two biggest weaknesses of the traditional O-ring: spiral failure and high friction.
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Material Excellence: FKM (Fluorocarbon)
Our FKM compounds are specifically formulated for chemical stability and thermal resilience. They are the preferred material for "mission-critical" seals in the aerospace and automotive industries.
| Property | FKM (Viton) Specification | Industrial Benefit |
|---|---|---|
| Temperature Range | -20°C to +200°C (Short term +230°C) | Maintains elasticity in extreme engine/oven heat. |
| Chemical Resistance | Excellent for Fuels, Oils, Acids, and Solvents | Prevents swelling and degradation in aggressive fluids. |
| Compression Set | Excellent (Typical <15% @ 200°C) | Ensures long-term sealing memory and prevents leaks. |
| Color | Black (Standard), Brown, Green | Color-coding available for material identification. |
Key Advantages
🚀 Performance Benefits
- ˚ ✵ Reduced Start-up Friction - Prevents "stick-slip" behavior.
- ˚ ✵ Superior Vacuum Sealing - Excellent for gas-tight requirements.
- ˚ ✵ High Pressure Stability - Resists extrusion better than O-rings.
- ˚ ✵ Enhanced Life Cycle - Outlasts standard seals by 2-3x in dynamic use.
🛠️ Technical Capabilities
- ˚ ✵ Standard AS568 & ISO 3601 sizes in stock.
- ˚ ✵ Custom metric sizes and large diameters available.
- ˚ ✵ Shore A Hardness range: 60 to 90 Durometer.
- ˚ ✵ Precision flash-free molding for critical tolerances.
Industrial Applications
Downhole tools & valves
Fuel injectors & turbochargers
Pumps, meters & reactors
Hydraulic actuators & landing gear
Technical Specifications
We provide FKM X-rings in all standard AS568 sizes, ensuring drop-in replacement for existing O-ring grooves without modifying hardware.
| Cross Section (W) | AS568 Series | Tolerance | Min/Max ID |
|---|---|---|---|
| 1.78 mm (.070") | 000 Series | ±0.08 mm | 1.07 mm to 133.07 mm |
| 2.62 mm (.103") | 100 Series | ±0.09 mm | 1.24 mm to 253.67 mm |
| 3.53 mm (.139") | 200 Series | ±0.10 mm | 4.34 mm to 456.06 mm |
| 5.33 mm (.210") | 300 Series | ±0.13 mm | 10.46 mm to 658.88 mm |
Precision Manufacturing
✶ Quality-Driven Production
- In-house Tooling – CNC machined steel molds ensure ±0.05mm tolerances on X-Ring lobes.
- Vacuum Compression Molding – Eliminates air traps and ensures 100% material density.
- Post-Curing – All FKM parts undergo a secondary heat cycle to stabilize physical properties.
- Cryogenic Deflashing – Removes excess material at sub-zero temperatures for a perfect finish.
100% Quality Inspection
Every FKM X-Ring batch undergoes rigorous testing in our ISO-certified lab before dispatch.
Automated optical sorting machines check ID and Cross-section for 100% accuracy.
Digital Shore A durometer testing to ensure compound consistency.
Microscopic check for flash, pits, or flow lines that could cause leaks.
Batch-coded documentation for full chain of custody on all FKM raw materials.
Packaging & Logistics
B2B excellence extends to our logistics. We ensure your seals arrive clean, un-deformed, and ready for assembly.
| Service Type | Details |
|---|---|
| Protective Packaging | Sealed UV-resistant PE bags (100–1,000 pcs) with label traceability. |
| Global Logistics | Daily pickups by FedEx, DHL, UPS and Sea/Air freight options from Xiamen Port. |
| Trade Options | FOB, CIF, DDP, and EXW terms supported for international procurement. |
Compliance & Certifications
FAQ – Technical Support
❓ Can I replace an O-ring with an X-ring in my current groove?
Yes. Quad-Rings are designed to fit standard O-ring grooves. In most cases, they outperform O-rings in the same geometry.
❓ Why is FKM more expensive than NBR (Nitrile)?
FKM offers vastly superior heat and chemical resistance. For applications above 100°C or exposure to aggressive fuels, FKM is necessary to prevent seal failure.
❓ What is the minimum order quantity (MOQ)?
For stock AS568 sizes, the MOQ is low (typically 100-500 pcs). For custom sizes requiring new tooling, please contact our engineering team.
♡ Related Products ♡
Why choose us?
- We provide personalized solutions to our customers' rubber X-ring requirements and offer technical advice and support.
- Striving for customer satisfaction has become the highest goal we pursue, enabling us to remain invincible in the competition.
- Our company provides excellent customer service and after-sales support to ensure our customers' satisfaction.
- All indicators of our products have been tested by the testing center and all meet the requirements. Our company is willing to cooperate with friends from all walks of life to create a brilliant future!
- Our company offers competitive prices for our rubber X-ring products, which makes them accessible to businesses of all sizes.
- We advocate forming a community of interest between customers and collaborators, and that those who give should be reasonably rewarded.
- We offer a wide range of rubber X-ring products that are suitable for different industries and applications.
- We are committed to guiding new development of X Ring Rubber Bullets through leading technology and R&D standards.
- Our company offers customized rubber X-ring products, depending on our client's specifications.
- While maximizing economic value, we also actively fulfill our responsibilities to society, customers, employees and other stakeholders to maximize comprehensive social benefits.
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