Stainless Steel Vacuum Centering Ring With FKM O-Ring

Stainless Steel Vacuum Centering Rings with FKM O-Rings are critical sealing components designed for high-vacuum and ultra-high-vacuum (UHV) applications. These precision-engineered rings are used in vacuum flanges to ensure perfect alignment and gas-tight sealing in semiconductor manufacturing, analytical instruments, research laboratories, and industrial vacuum systems.

The centering ring consists of a precisely machined stainless steel body (SS304 or SS316L) with an integrated elastomer O-ring groove. The FKM (Fluoroelastomer/Viton®) O-ring provides exceptional chemical resistance, high-temperature stability, and excellent sealing performance under vacuum conditions.

Available in standard ISO-KF, ISO-K, and CF flange sizes, these centering rings ensure leak-tight connections from atmospheric pressure down to 10⁻⁹ mbar, making them ideal for demanding vacuum applications.

Vacuum centering rings from Xiamen Best Seal Imp. & Exp. Co., Ltd comply with ISO 3669, ASTM standards, and meet FDA 21 CFR 177.2600 requirements for elastomer materials.

1. Superior Material Selection

Manufactured from high-grade SS304 or SS316L stainless steel with excellent corrosion resistance. FKM elastomer complies with FDA 21 CFR 177.2600 standards for food and pharmaceutical contact applications.

2. Precision Engineering

CNC-machined to tight tolerances (±0.05mm) ensuring perfect alignment between vacuum flanges and eliminating potential leak paths. Surface finish Ra ≤ 0.8 μm guarantees smooth sealing surfaces.

3. High Vacuum Integrity

Achieves leak rates below 10⁻⁹ mbar·l/s, suitable for ultra-high-vacuum applications in semiconductor manufacturing and research environments. Compatible with all standard vacuum pump-down procedures.

4. Exceptional Chemical Compatibility

FKM O-rings resist a wide range of aggressive chemicals, oils, fuels, acids, alkalis, and solvents commonly used in vacuum processes, including IPA, acetone, and cleaning agents.

5. Wide Temperature Stability

Operating range from -20°C to +200°C makes these rings suitable for bake-out procedures and high-temperature vacuum processes without compromising seal integrity.

6. Reusability & Long Service Life

The stainless steel body is virtually indestructible and reusable indefinitely. O-rings withstand multiple assembly/disassembly cycles (50-100 times) with proper handling and storage.

7. Universal Flange Compatibility

Available in all standard ISO-KF (Klein Flange), ISO-K, and CF (ConFlat®) sizes, ensuring compatibility with global vacuum equipment manufacturers.

Main Applications

1. Semiconductor manufacturing equipment (CVD, PVD, etching systems)
2. Analytical instruments (mass spectrometers, electron microscopes)
3. Vacuum coating and thin film deposition systems
4. Research laboratories and particle accelerators
5. Pharmaceutical freeze dryers and sterilization equipment
6. Industrial vacuum pumps and leak detection systems
7. Space simulation chambers and vacuum furnaces

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Note: ISO-K (NW) and CF flange sizes also available. Custom sizes can be manufactured to meet specific application requirements.

Proper Installation Procedure:

1. Surface Cleaning: Ensure flange surfaces are thoroughly cleaned and free from particles, oils, fingerprints, or contaminants. Use isopropanol or acetone with lint-free wipes.
2. O-Ring Inspection: Check the O-ring for any damage, cracks, deformation, or contamination. Replace immediately if any defects are found.
3. Lubrication (Optional): Apply a thin layer of vacuum-compatible grease (e.g., Apiezon L or Krytox) to the O-ring for improved sealing and extended service life.
4. Ring Positioning: Center the ring precisely between the flanges, ensuring the O-ring sits properly in the groove without twisting or pinching.
5. Clamping: Tighten clamps or bolts evenly in a cross-pattern to the specified torque (typically 6-10 Nm for KF flanges, consult manufacturer specifications).
6. Leak Testing: Perform helium leak testing to verify seal integrity achieves required vacuum level before system operation.

Maintenance & O-Ring Replacement:

The stainless steel centering ring body requires minimal maintenance and can be reused indefinitely with proper care. Clean with solvents and inspect for scratches or deformation before each use.

The FKM O-ring should be inspected regularly and replaced when:

• Visible compression set exceeds 20% (permanent deformation)
• Surface cracks, tears, or cuts are observed
• Hardness increase is detected (becoming brittle or stiff)
• Leak rates exceed acceptable limits during routine testing
• After 50-100 thermal cycles (depending on temperature and conditions)
• After exposure to incompatible chemicals or extreme temperatures

Storage Recommendations: Store replacement O-rings in a cool (below 25°C), dark, dry environment away from direct sunlight, ozone sources, electrical equipment, and incompatible chemicals. Keep in sealed bags with desiccant.

📦 Packaging Options：

🚚 Shipping Methods

• Express shipping: DHL / FedEx / UPS 
• Air freight for urgent orders 
• Sea freight for bulk orders 
• Trade terms: FOB / CIF / DDP / EXW / DAP available

With over 20 years of manufacturing excellence in precision sealing components, Xiamen Best Seal Imp. & Exp. Co., Ltd. is a trusted partner for vacuum technology worldwide. We specialize in high-performance O-rings, gaskets, oil seals, and custom rubber components for demanding industrial applications.

Global Reputation: Exported to 68 countries across North America, Europe, Asia, and Oceania, with more than 450 long-term customers including Fortune 500 companies, research institutions, and leading equipment manufacturers.

Production Capacity: Our modern factory spans 3,600 square meters, equipped with 36 dedicated production lines and staffed by over 100 skilled technicians and engineers. Daily production capacity reaches up to 5 million pieces, ensuring rapid delivery and consistent quality.

Quality Systems: ISO 9001:2015 certified manufacturing facility with comprehensive quality control at every production stage. In-house testing laboratory equipped with Shore hardness testers, tensile strength analyzers, compression set fixtures, and helium leak detectors.

Our vacuum centering rings and elastomer materials comply with major international standards, including:
ISO 9001:2015, ISO 3669, ASTM D2000, ASTM A240, FDA 21 CFR 177.2600, RoHS, REACH, CE.

All materials undergo rigorous testing and validation:

• Material Analysis: XRF and ICP testing for composition verification
• Dimensional Inspection: CMM (Coordinate Measuring Machine) for precision validation
• Vacuum Testing: Helium leak detection to 10⁻¹⁰ mbar·l/s sensitivity
• Mechanical Testing: Tensile strength, elongation, and tear resistance per ASTM D412
• Compression Set: Long-term deformation testing per ASTM D395
• Surface Finish: Profilometer measurement for Ra values
• Chemical Resistance: Immersion testing in process chemicals

Each production batch includes a Certificate of Compliance (CoC) with full traceability, test reports available upon request.

Contact Us for Technical Support & Quotations：

Xiamen Best Seal Imp. & Exp. Co., Ltd.

Tel: +86-592-5782315

Mobile: +86 189 5015 9396

Email: yunying2@bestsealhk.com

Website: www.bestsealhk.com

Address: Unit 522-525, Gaodian Road 6#, Huli District, Xiamen, Fujian 361006, China

We provide 24/7 technical consultation, free samples, custom engineering solutions, and comprehensive after-sales support for all your vacuum sealing requirements.

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