Edwards Centring Ring Only Aluminum DN 25 ISO-KF NW25 Lot of 25 Center Rings

Edwards DN 25 ISO-KF Centering Ring Only – Aluminum, Lot of 25

The Edwards DN 25 centering ring is a precision-engineered structural component designed to align and support the elastomer seal between two NW25 (KF25) vacuum flanges. This lot of 25 "ring-only" components is intended for high-volume laboratories and facilities that maintain their own stock of O-rings (such as FKM, Nitrile, or Silicone) or require frequent replacement of the metal carrier due to mechanical wear or contamination. These rings ensure a repeatable, concentric seal that prevents O-ring extrusion under vacuum pressure.

Technical Performance & Design

• Precision Aluminum Machining: Fabricated from high-grade aluminum alloy, providing a lightweight yet rigid frame that ensures a metal-to-metal stop between flanges, preventing over-compression of the seal.
• High-Vacuum Compatibility: Designed to support vacuum integrity down to $10^{-8}$ mbar when paired with high-quality elastomers and standard ISO-KF wing-nut clamps.
• Standard ISO-KF Interface: Fully compliant with ISO 2861 dimensional standards, ensuring universal compatibility with NW25, KF25, and DN 25 flanges from all major vacuum hardware manufacturers.
• Tapered Inner Geometry: Features a smooth, tapered profile to maximize conductance and minimize turbulence in the vacuum line, which is critical for efficient pump-down cycles.

Product Specifications

• Part Number: Component of C10514398 / C10514399 series
• Flange Size: DN 25 ISO-KF (NW25 / KF25)
• Material: Aluminum
• Configuration: Center Ring Only (O-Ring not included)
• Quantity: Lot of 25 Rings
• Outside Diameter: Approx. 26 mm (Standard for DN 25 inner carrier)

Key Benefits & Applications

• Cost-Effective Bulk Maintenance: This lot of 25 is ideal for large-scale vacuum manifolds and facilities where rings are treated as semi-consumable parts during aggressive cleaning or "bake-out" procedures.
• Custom Seal Flexibility: Allows users to choose their own O-ring material (e.g., swapping between Buna-N for roughing and Viton for high-temp) without being restricted to pre-assembled sets.
• Primary & Secondary Vacuum Lines: Frequently used in foreline plumbing, bypass valves, and exhaust lines for rotary vane, scroll, and turbomolecular pumps.
• Rapid Bench-Top Assembly: The KF (Kleinflansch) shorthand design allows for quick, tool-free installation, making it the preferred standard for modular R&D and bioprocessing setups.

Edwards® and the Edwards logo are trademarks of Edwards Limited. ISO-KF, NW, and KF refer to international vacuum hardware standards (ISO 2861 / DIN 28403). Ensure O-rings are lubricated with high-vacuum grease (e.g., Apiezon) for optimal performance.