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DN350CF (16.50″ OD) 304L SS Standard ConFlat® (CF) UHV Flanges

Why Choose the DN350CF (16.50″ OD) 304L SS Standard ConFlat® UHV Flange from TFM?

When it comes to building or upgrading an ultra-high vacuum (UHV) system, component quality and precision are essential. Among the most critical pieces in any vacuum system are the flanges—responsible for maintaining the integrity of the vacuum seal under extreme conditions. The DN350CF (16.50″ OD) 304L SS Standard ConFlat® Flange, available from TFM, stands out as a top-tier choice for professionals in research, semiconductor, aerospace, and other high-tech industries.

Built for Demanding UHV Environments

The DN350CF ConFlat® flange is designed specifically for ultra-high vacuum applications, where performance, durability, and compatibility matter most. With a large 16.50-inch outer diameter, this flange supports high-capacity vacuum chambers and complex assemblies that require reliable, leak-tight connections.

Superior Material: 304L Stainless Steel

TFM manufactures this flange using 304L stainless steel, known for its excellent corrosion resistance, low carbon content, and superior weldability. This makes it particularly suitable for cleanroom environments and vacuum systems that demand contamination-free components. The low carbon content also minimizes the risk of carbide precipitation during welding, ensuring structural integrity and vacuum reliability.

Industry-Standard ConFlat® Design

The DN350CF flange features a knife-edge sealing surface, a hallmark of the ConFlat® standard. This design compresses a soft copper gasket between flanges, creating a secure, metal-to-metal seal that withstands extremely low pressures and resists outgassing. The ConFlat® format ensures full compatibility with other CF components, simplifying system integration and future upgrades.

Key Benefits of the DN350CF Flange

  • Precision Machined: Each flange is manufactured to tight tolerances for consistent performance.

  • Vacuum Integrity: Supports pressures down to 10⁻¹² Torr, making it ideal for UHV environments.

  • Corrosion Resistance: 304L stainless steel provides lasting durability and stability.

  • Scalability: The DN350CF is suitable for large vacuum systems where high conductance is needed.

  • Ease of Integration: Fully compatible with standard CF vacuum components, including viewports, valves, and feedthroughs.

Applications Across Advanced Industries

The DN350CF flange is not just a part—it’s a solution for critical vacuum environments. TFM’s customers use these flanges in:

  • Semiconductor fabrication

  • Surface science instrumentation

  • Nuclear fusion and particle physics

  • Synchrotron radiation facilities

  • Aerospace vacuum testing

Whether you’re designing a new vacuum system or retrofitting an existing one, the DN350CF offers the robustness and performance required for high-stakes applications.

Why Buy from TFM?

TFM is a trusted supplier of high-quality vacuum components, offering:

  • Consistent stock and quick delivery

  • Technical expertise and responsive support

  • Competitive pricing on premium-grade materials

  • Customization options upon request

With a strong focus on reliability, TFM ensures that every component—like the DN350CF flange—is ready to meet the challenges of modern UHV applications.

Ordering Table

Flange Size/OD Type Part Number
DN350CF (16.50" OD) Fixed F1650X000N
DN350CF (16.50" OD) Fixed Tapped F1650X000NM
DN350CF (16.50" OD) Fixed Tapped F1650X000NT
DN350CF (16.50" OD) Rotatable F1650X000R
DN350CF (16.50" OD) Rotatable Tapped F1650X000RT
DN350CF (16.50" OD) Fixed F1650X1400N
DN350CF (16.50" OD) Fixed Tapped F1650X1400NM
DN350CF (16.50" OD) Fixed Tapped F1650X1400NT
DN350CF (16.50" OD) Rotatable F1650X1400R
DN350CF (16.50" OD) Rotatable Tapped F1650X1400RT

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FAQ

Tube fittings are designed for tubes (measured by outside diameter and wall thickness) used in high-pressure and instrumentation applications, whereas pipe fittings are for pipes (identified by nominal pipe size) primarily used in fluid transport.

 

Common valve types include ball valves, gate valves, check valves, butterfly valves, and globe valves. Each serves a specific function—from quick shutoff (ball/gate valves) to flow regulation (globe valves).

 

  • For tubing, measure the outside diameter; for pipes, refer to the nominal pipe size (using conversion charts if needed). Always match the valve or fitting size to your pipe’s dimensions and flow requirements.

  • Frequently used thread types include NPT (National Pipe Tapered), BSP (British Standard Pipe), and UNC, along with slip-fit options that rely on compression or fusion rather than threads.

Interchangeability depends on manufacturer specifications and certification. Always verify compatibility via manufacturer guides or certified interchangeability charts.

 

  • A coupling is a short, straight fitting used to join two pipes or tubes. It provides a secure, leak-tight connection and can sometimes serve to extend or repair piping runs.

Consider valve type, pressure and temperature ratings, material compatibility with your fluid, actuation method (manual or automatic), and maintenance requirements.

 

  • Valves regulate flow by opening, closing, or partially obstructing the pathway. Their mechanisms (such as the rotation of a ball or the linear movement of a gate) determine the speed and precision of flow control.

  • A flange is a flat, circular component used to connect pipes, valves, or other equipment. Bolted together with gaskets, flanges provide a secure, leak-proof joint that facilitates both assembly and maintenance.

  • Manual valves require physical operation via handles or levers, whereas actuated valves use mechanisms—pneumatic, electric, or hydraulic—to open and close automatically or remotely.

  • Issues include leaks caused by improper installation, over-tightening, degraded seals, material incompatibility, and fatigue from repeated cycling. Regular inspection and proper installation practices help mitigate these problems.

Regular maintenance involves periodic inspections, cleaning or replacing worn seals, ensuring proper torque during installation, and adhering to manufacturer guidelines and local plumbing codes to preserve system integrity.

 

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