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Sonkit Sealing Solutions
Metal O-Ring Seal
Metal O-Ring Seal
Metal C-Ring Seal
Metal C-Ring Seal
Metal U-Ring Seal
Metal U-Ring Seal
Metal V-Ring Seal
Metal V-Ring Seal
Metal E-Ring Seal
Metal E-Ring Seal
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Inside Sonkit's Advanced Test Lab: Pushing the Limits of Metal Seal Technology
Video: Sonkit's Metal U-Ring Seals: Engineered for Extreme Conditions
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Featured Products
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Spring-Energized Metal C-Ring Seal
Spring-Energized Metal C-Ring Seal
Metal C-Ring Seal
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  • Designed for high pressure
  • Excellent tightness
  • High bolting load requirement
  • Good spring back
Standard Metal C-Ring Seal
Standard Metal C-Ring Seal
Metal C-Ring Seal
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  • Designed for high-pressure applications:
  • Low bolting load requirement
  • Good spring back
  • High-Temperature Applications
Metal W-Ring Seal
Metal W-Ring Seal
Metal E-Ring Seal
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  • High springback with low load requirement
  • Corrosion and radiation resistance
  • Large and segmented diameters available (>2000 mm)
One-stop Metal Seal Solution, So you can focus on your own engineering design.
Contact Us

  • 400 7167 800

  • johnny@sonkit.cn

Application
Applications
Company
Pioneering Excellence in Metal Sealing Rings Research and Production
Innovative Manufacturer Delivering High-Reliability Sealing Solutions
  • Year 2010
    Was Founded In
  • 20 Million Yuan
    Registered Capital
  • 2000 +
    Customers
News
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2026-05-18
Cryogenic Valve Leakage Is Back in Focus: What LNG and Liquid Hydrogen Projects Should Specify in Metal Seals
Cryogenic valve leakage in LNG and liquid hydrogen projects depends on seal geometry, material behavior, preload, surface finish, and helium leak testing. Learn what to specify in Metal C-Rings, Metal O-Rings, U-Rings, and spring-energized metal seals.
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2026-05-08
Helium Leak-Tight Sealing Is Becoming a Shared Bottleneck for Nuclear Microreactors and Semiconductor Vacuum Tools
Explore how helium leak-tight metal seals are addressing critical bottlenecks in nuclear microreactors and semiconductor manufacturing. Learn about Sonkit’s C-Ring solutions designed for ultra-high vacuum and high-temperature environments.
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2026-04-24
Metal Seals for High-Temperature Valve Seats: Where Elastomers Fail First
Learn why elastomer seals fail first in high-temperature valve seats and how Sonkit metal seals improve seat integrity, leakage control, thermal stability, and severe-service valve reliability.
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2026-04-06
Hydrogen Electrolyzer Scale-Up Is Putting Leak-Tight Sealing and Valve Integrity Under the Spotlight
Hydrogen electrolyzer scale-up is raising the bar for leak-tight sealing and valve integrity. Explore why metal seals, cryogenic duty, and semiconductor-grade leak-testing discipline are becoming critical to hydrogen system reliability.
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2026-03-16
Sonkit Obtains D-U-N-S® Number, Accelerating Global Market Expansion
Sonkit has obtained the D-U-N-S® Number, strengthening its position as a global high-performance metal seal manufacturer. Discover what this means for international partnerships.
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Technical Articles
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2026-05-25
Sealing Liquid Helium: Low-Preload Racetrack Metal C-Rings for MRI and CT Scanner Hardware
Learn how low-preload racetrack Metal C-Rings help seal liquid helium systems in MRI, CT, and cryogenic medical hardware.
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2026-05-18
Why Metal Seals Leak: 7 Failure Modes Engineers Miss in the Groove, Flange, and Load Path
When metal seals leak, the cause is often groove geometry, flange finish, bolt load, plating, springback, thermal movement, or installation damage. Learn 7 metal seal failure modes engineers often miss.
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2026-04-15
Blade Type Spring-Energized Seals for Semiconductor CVD and Etch Equipment
Blade type spring-energized metal seals help semiconductor CVD and etch equipment achieve lower seating load, cleaner all-metal sealing, and reliable vacuum performance.
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2026-04-06
Zero-Preload Metal Seals for Fusion and Accelerator Systems: Why Controlled Seating Load Matters in UHV Hardware
Learn why zero-preload and low-seating-load metal seals matter in fusion and accelerator systems. Explore how controlled-load metallic sealing helps protect precision flanges, support ultra-high vacuum, and reduce assembly risk in RF,
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2026-03-31
RFQ Cavity Sealing: Overcoming Ultra-High Vacuum and RF Electrical Continuity Challenges with Advanced Metal Seals
Discover how Sonkit advanced metal seals—including CIPP dual-stage seals, and aluminum-jacketed spring-energized metal C-rings—solve RFQ cavity sealing, Ultra-High Vacuum (UHV) leakage, outgassing, in particle accelerators and high-power RF systems.
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