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DN25CF (2.125″ OD) 304L SS Standard ConFlat® (CF) UHV Flanges

Precision and Reliability with the DN25CF (2.125″ OD) 304L SS Standard ConFlat® UHV Flange from TFM

For ultra-high vacuum (UHV) systems, even the smallest components play a vital role in ensuring optimal performance. The DN25CF (2.125″ OD) 304L SS Standard ConFlat® Flange from TFM is the ideal choice for those seeking a reliable, high-performance flange in small-scale UHV applications where precision and tight seals are critical.

Optimized for Ultra-High Vacuum Applications

The DN25CF flange features a compact 2.125-inch outer diameter, making it perfect for systems that require smaller yet robust vacuum interfaces. Adhering to ConFlat® (CF) standards, this flange incorporates a knife-edge sealing surface, which, when paired with a copper gasket, creates a reliable metal-to-metal seal. This ensures leak-tight performance in UHV conditions down to 10⁻¹² Torr.

Designed for easy integration into small UHV chambers, this flange excels in applications where space is limited but vacuum integrity is paramount.

Premium Material: 304L Stainless Steel

Constructed from 304L stainless steel, the DN25CF flange offers excellent corrosion resistance, high strength, and exceptional weldability. The low carbon content in 304L reduces the risk of carbide precipitation during welding, ensuring a strong, contamination-free weld. This ensures long-lasting durability and reliable performance under harsh UHV conditions.

TFM’s strict manufacturing processes ensure that each flange is CNC-machined to precise tolerances, delivering an ultra-smooth surface finish and exacting flatness to guarantee reliable sealing.

Key Features of the DN25CF Flange

  • Material: High-quality 304L stainless steel for excellent corrosion resistance

  • Size: 2.125″ outer diameter, ideal for compact UHV systems

  • Vacuum Performance: Designed to withstand pressures as low as 10⁻¹² Torr

  • Seal Type: ConFlat® knife-edge design paired with a copper gasket for superior sealing

  • Precision Machining: CNC precision for consistent performance and superior surface finish

  • Standard Compatibility: Fully interchangeable with other CF vacuum components

Versatile Applications Across Industries

The DN25CF flange is widely used in various fields that demand reliable UHV performance, including:

  • Laboratory research and surface science

  • Small-scale semiconductor processing

  • Mass spectrometry and spectroscopy systems

  • Photonics and optical systems

  • Vacuum pumping stations

Its small size and robust sealing capacity make it an ideal choice for precise and reliable vacuum systems that require high-quality flanges.

Why Choose TFM?

TFM is a trusted supplier of vacuum components known for:

  • Fast shipping and on-time delivery

  • Technical expertise and responsive customer support

  • Competitive pricing without compromising quality

  • Custom solutions available for unique vacuum system needs

TFM’s commitment to providing top-tier vacuum components ensures that the DN25CF flange will meet and exceed your expectations in both performance and durability.

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 Drawing Nominal Tube OD Bore Counter Bore Thickness Bolt Circle Dia. Bolt Hole Dia. # of Bolt Holes Thread Size Setback Part Number
DN25CF (2.13" OD) Fixed 304L SS Tooltip — Blank — 0.47 1.625 0.265 4 — — F0212X000N
DN25CF (2.13" OD) Fixed Tapped 304L SS Tooltip — Blank — 0.47 1.625 — 4 1/4-28 — F0212X000NT
DN25CF (2.13" OD) Rotatable 304L SS Tooltip — Blank — 0.47 1.625 0.265 4 — — F0212X000R
DN25CF (2.13" OD) Rotatable Tapped 304L SS Tooltip — Blank — 0.47 1.625 — 4 1/4-28 — F0212X000RT
DN25CF (2.13" OD) Fixed 304L SS Tooltip 1/4 0.255 — 0.47 1.625 0.265 4 — — F0212X025N
DN25CF (2.13" OD) Fixed Tapped 304L SS Tooltip 1/4 0.255 — 0.47 1.625 — 4 1/4-28 — F0212X025NT
DN25CF (2.13" OD) Rotatable 304L SS Tooltip 1/4 0.255 — 0.47 1.625 0.265 4 — — F0212X025R
DN25CF (2.13" OD) Rotatable Tapped 304L SS Tooltip 1/4 0.255 — 0.47 1.625 — 4 1/4-28 — F0212X025RT
DN25CF (2.13" OD) Fixed 304L SS Tooltip 1/2 0.505 — 0.47 1.625 0.265 4 — — F0212X050N
DN25CF (2.13" OD) Fixed Tapped 304L SS Tooltip 1/2 0.505 — 0.47 1.625 — 4 1/4-28 — F0212X050NT
DN25CF (2.13" OD) Rotatable 304L SS Tooltip 1/2 0.505 — 0.47 1.625 0.265 4 — — F0212X050R
DN25CF (2.13" OD) Rotatable Tapped 304L SS Tooltip 1/2 0.505 — 0.47 1.625 — 4 1/4-28 — F0212X050RT
DN25CF (2.13" OD) Fixed 304L SS Tooltip 3/4 0.72 0.760 0.47 1.625 0.265 4 — 0.170 F0212X075N
DN25CF (2.13" OD) Fixed Tapped 304L SS Tooltip 3/4 0.72 0.760 0.47 1.625 — 4 1/4-28 0.170 F0212X075NT
DN25CF (2.13" OD) Rotatable 304L SS Tooltip 3/4 0.72 0.770 0.47 1.625 0.265 4 — 0.170 F0212X075R
DN25CF (2.13" OD) Rotatable Tapped 304L SS Tooltip 3/4 0.72 0.770 0.47 1.625 — 4 1/4-28 0.170 F0212X075RT
DN25CF (2.13" OD) Fixed 304L SS Tooltip 1 0.94 1.010 0.47 1.625 0.265 4 — 0.170 F0212X100N
DN25CF (2.13" OD) Fixed Tapped 304L SS Tooltip 1 0.94 1.010 0.47 1.625 — 4 M6 x 1.0P 0.170 F0212X100NM
DN25CF (2.13" OD) Fixed Tapped 304L SS Tooltip 1 0.94 1.010 0.47 1.625 — 4 1/4-28 0.170 F0212X100NT
DN25CF (2.13" OD) Rotatable 304L SS Tooltip 1 0.94 1.020 0.47 1.625 0.265 4 — 0.170 F0212X100R
DN25CF (2.13" OD) Rotatable Tapped 304L SS Tooltip 1 0.94 1.020 0.47 1.625 — 4 1/4-28 0.170 F0212X100RT

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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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