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DN250CF (12.00″ OD) 304L SS Standard ConFlat® (CF) UHV Flanges

Enhance Your Vacuum System with the DN250CF (12.00″ OD) 304L SS Standard ConFlat® UHV Flange from TFM

In ultra-high vacuum (UHV) environments, every component must be engineered for absolute reliability. The DN250CF (12.00″ OD) 304L SS Standard ConFlat® Flange, offered by TFM, delivers the precise sealing performance and durability required in high-vacuum operations across research, industrial, and semiconductor fields.

Precision Engineering for UHV Applications

The DN250CF flange is crafted for use in UHV systems where even the slightest imperfection can lead to leaks or contamination. With an outer diameter of 12.00 inches, this flange provides a secure, stable interface for connecting large vacuum chambers, viewports, feedthroughs, and other critical components.

Its ConFlat® (CF) design features a knife-edge sealing surface that compresses copper gaskets to form leak-tight, metal-to-metal seals. This makes it ideal for environments where pressures reach down to 10⁻¹² Torr.

Built from 304L Stainless Steel for Long-Term Stability

TFM uses 304L stainless steel in the construction of this flange, selected for its corrosion resistance, low carbon content, and excellent weldability. The material ensures structural integrity, cleanliness, and longevity, even under the most rigorous vacuum conditions.

With a focus on precision machining and surface flatness, TFM ensures that each DN250CF flange meets the highest quality standards for vacuum sealing and mechanical compatibility.

Features & Benefits of the DN250CF Flange

  • Vacuum-Optimized Design: CF knife-edge sealing with copper gaskets for UHV performance.

  • 304L Stainless Steel Construction: High-purity material for reliable performance and minimal contamination.

  • Large Diameter Interface: 12.00″ OD supports robust system designs.

  • Standard Compatibility: Fully interchangeable with other CF flanges and vacuum system parts.

  • Precision Manufacturing: CNC-machined for consistency, tight tolerances, and excellent sealing surface quality.

Applications Across Vacuum-Intensive Industries

The DN250CF flange is trusted by engineers and researchers working in:

  • Semiconductor processing equipment

  • UHV analytical instrumentation

  • Synchrotron beamlines and particle accelerators

  • Surface science and thin film deposition systems

  • Space simulation and cryogenic vacuum chambers

Its versatility and reliability make it a go-to solution for projects that demand uncompromising vacuum performance.

Why Source from TFM?

TFM is a dependable provider of high-quality UHV components and accessories. When you choose TFM, you benefit from:

  • Consistent product availability and timely delivery

  • High-quality stainless steel materials

  • Technical expertise and personalized support

  • Custom solutions for specialized vacuum system needs

Every DN250CF flange from TFM is built to meet or exceed the demanding requirements of modern UHV systems.

Through (Clearance) Holes

Are through-holes that allow adequate clearance for bolts to go through both flanges and secured by nuts or plate nuts.

Tapped Holes

Are imperial or metric threaded holes machined through the flange. This allows a clearance-hole flange to be connected without the need for nuts or plate nuts. Be aware of a components bolt hole orientation when selecting tapped flanges.

Ordering Table

Flange Size/OD Type Flange Material Part Number
DN250CF (12.00" OD) Rotatable Tapped 304L SS F1200X000RM
DN250CF (12.00" OD) Rotatable Tapped 304L SS F1200X000RT
DN250CF (12.00" OD) Rotatable Tapped 304L SS F1200X1000RM
DN250CF (12.00" OD) Rotatable Tapped 304L SS F1200X1000RT
DN250CF (12.00" OD) Rotatable 304L SS F1200X000R
DN250CF (12.00" OD) Rotatable 304L SS F1200X1000R
DN250CF (12.00" OD) Fixed Tapped 304L SS F1200X000NM
DN250CF (12.00" OD) Fixed Tapped 304L SS F1200X000NT
DN250CF (12.00" OD) Fixed Tapped 304L SS F1200X1000NM
DN250CF (12.00" OD) Fixed Tapped 304L SS F1200X1000NT
DN250CF (12.00" OD) Fixed 304L SS F1200X000N
DN250CF (12.00" OD) Fixed 304L SS F1200X1000N

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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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