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DN75CF (4.625″ OD) 304L SS Standard ConFlat® (CF) UHV Flanges

Introduction

DN75CF (4.625″ OD) 304L SS Standard ConFlat® (CF) UHV Flanges are industry-standard vacuum components engineered for ultra-high-vacuum (UHV) applications where leak integrity, thermal stability, and cleanliness are critical. Using the proven ConFlat knife-edge sealing principle, these flanges deliver repeatable, metal-to-metal seals suitable for advanced research, semiconductor processing, and high-end vacuum systems.

Detailed Description

The DN75CF flange features a 4.625-inch outer diameter and precision-machined knife edges designed to plastically deform a copper gasket, forming a robust UHV seal. Fabricated from 304L stainless steel, the low-carbon composition minimizes carbide precipitation during welding and bakeout, improving corrosion resistance and long-term vacuum performance.

Each flange is manufactured to tight dimensional tolerances to ensure full compatibility with standard DN75CF hardware, including copper gaskets, bolts, and nuts. The smooth sealing surfaces and controlled edge geometry contribute to low particle generation and consistent sealing across repeated assembly cycles.

Key features include:

  • True ConFlat knife-edge geometry for metal gasket sealing

  • Vacuum-grade 304L stainless steel construction

  • Excellent bakeout compatibility for UHV environments

  • High mechanical strength and resistance to deformation

Applications

  • Ultra-high-vacuum chambers and beamlines

  • Semiconductor process equipment and load-lock systems

  • Thin film deposition tools (PVD, sputtering, evaporation)

  • Surface science, accelerators, and research instruments

  • Vacuum furnaces and analytical systems

Technical Parameters

ParameterTypical Value / RangeImportance
Flange TypeDN75CF (ConFlat®)Industry-standard UHV interface
Outer Diameter4.625 in (≈117.5 mm)Ensures hardware compatibility
Material304L Stainless SteelLow outgassing, weld-friendly
Sealing MethodCopper gasket, knife-edgeReliable UHV metal seal
Bakeout CapabilityUp to ~450 °C (gasket-limited)Supports UHV conditioning
Typical Leak Rate≤ 1×10⁻¹¹ mbar·L/sConfirms UHV performance

Comparison with Related CF Flanges

Flange SizeKey AdvantageTypical Application
DN75CF (4.625″ OD)Balanced size, high conductanceUHV chambers & tools
DN40CFCompact footprintSmall instruments
DN100CFLarger aperture, higher flowHigh-throughput systems

FAQ

QuestionAnswer
Are copper gaskets included?Typically supplied separately unless requested.
Is 304L suitable for welding?Yes, 304L is preferred for welded vacuum assemblies.
Can these flanges be baked for UHV?Yes, within gasket temperature limits.
Are custom ports or modifications available?Yes, machining and welding services are available.
How are the flanges cleaned?Cleaned for vacuum service and packaged to prevent contamination.

Packaging

Our DN75CF (4.625″ OD) 304L SS Standard ConFlat® (CF) UHV Flanges are individually cleaned, capped on sealing surfaces, and vacuum-packed. Protective foam and export-grade cartons or wooden crates are used to ensure damage-free delivery and maintained cleanliness.

Conclusion

DN75CF (4.625″ OD) 304L SS Standard ConFlat® (CF) UHV Flanges provide dependable sealing, thermal robustness, and full compatibility with UHV systems worldwide. Their precision machining and vacuum-grade materials make them a trusted foundation for critical vacuum assemblies.
For detailed specifications and a quotation, please contact us at sales@thinfilmmaterials.com.

Ordering Table

Flange Size/OD Type Flange Material Part Number
DN75CF (4.63" OD) Fixed 304L SS F0462X000N
DN75CF (4.63" OD) Fixed Tapped 304L SS F0462X000NT
DN75CF (4.63" OD) Rotatable 304L SS F0462X000R
DN75CF (4.63" OD) Rotatable Tapped 304L SS F0462X000RT
DN75CF (4.63" OD) Fixed 304L SS F0462X200N
DN75CF (4.63" OD) Fixed 304L SS F0462X250N
DN75CF (4.63" OD) Fixed Tapped 304L SS F0462X250NT
DN75CF (4.63" OD) Rotatable 304L SS F0462X250R
DN75CF (4.63" OD) Rotatable Tapped 304L SS F0462X250RT
DN75CF (4.63" OD) Fixed 304L SS F0462X300N
DN75CF (4.63" OD) Fixed Tapped 304L SS F0462X300NT
DN75CF (4.63" OD) Rotatable 304L SS F0462X300R
DN75CF (4.63" OD) Rotatable Tapped 304L SS F0462X300RT
Flange Size/OD Type Flange Material Part Number

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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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