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DN63CF (4.50″ OD) 316LN SS Standard ConFlat® (CF) UHV Flanges

Introduction

DN63CF (4.50″ OD) 316LN SS Standard ConFlat® (CF) UHV Flanges are precision-engineered vacuum components designed for ultra-high-vacuum (UHV) environments that demand exceptional sealing reliability, mechanical strength, and thermal stability. Utilizing the proven ConFlat knife-edge sealing principle, these flanges are widely adopted in advanced research facilities, semiconductor manufacturing, and high-performance vacuum systems.

Detailed Description

The DN63CF flange features a 4.50-inch outer diameter and accurately machined knife edges that deform a soft copper gasket to create a repeatable, metal-to-metal UHV seal. Manufactured from 316LN stainless steel, the alloy offers enhanced strength, improved resistance to corrosion, and excellent performance during high-temperature bakeouts. The controlled nitrogen content further improves mechanical stability while maintaining low outgassing characteristics.

These flanges are produced to tight dimensional tolerances to ensure full interchangeability with standard DN63CF hardware, including copper gaskets, studs, and nuts. The carefully finished sealing surfaces and consistent knife-edge geometry help minimize particle generation and ensure long-term vacuum integrity, even after multiple assembly cycles.

Key features include:

  • Precision ConFlat knife-edge geometry for copper gasket sealing

  • 316LN stainless steel for superior strength and corrosion resistance

  • Excellent bakeout compatibility for UHV conditioning

  • Consistent dimensional accuracy for repeatable sealing performance

Applications

  • Ultra-high-vacuum chambers and experimental beamlines

  • Semiconductor process tools and load-lock systems

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

  • Surface science, accelerator, and physics research systems

  • High-temperature vacuum furnaces and analytical instruments

Technical Parameters

ParameterTypical Value / RangeImportance
Flange TypeDN63CF (ConFlat®)Standard UHV interface
Outer Diameter4.50 in (≈114.3 mm)Hardware and gasket compatibility
Material316LN Stainless SteelStrength, corrosion resistance
Sealing MethodCopper gasket, knife-edgeReliable metal UHV seal
Bakeout CapabilityUp to ~450 °C (gasket-limited)Suitable for UHV conditioning
Typical Leak Rate≤ 1×10⁻¹¹ mbar·L/sConfirms UHV performance

Comparison with Related CF Flanges

Flange SizeKey AdvantageTypical Application
DN63CF (4.50″ OD)Compact with high performanceUHV chambers & tools
DN40CFSmaller footprintCompact instruments
DN75CFLarger apertureHigher conductance systems

FAQ

QuestionAnswer
Are copper gaskets included?Typically supplied separately unless specified.
Why choose 316LN over 304L?316LN offers higher strength and better corrosion resistance, especially at elevated temperatures.
Is this flange suitable for welding?Yes, 316LN is well suited for welded vacuum assemblies.
Can these flanges be baked for UHV use?Yes, within copper gasket temperature limits.
Are custom machining or welded assemblies available?Yes, custom ports, blanks, and welded components can be provided.

Packaging

Our DN63CF (4.50″ OD) 316LN SS Standard ConFlat® (CF) UHV Flanges are ultrasonically cleaned, capped on the knife-edge surfaces, and vacuum-packed. Each flange is clearly labeled and shipped with protective foam and export-grade cartons or wooden crates to maintain cleanliness and prevent damage during transportation.

Conclusion

DN63CF (4.50″ OD) 316LN SS Standard ConFlat® (CF) UHV Flanges deliver reliable metal sealing, excellent thermal performance, and long-term durability for demanding UHV applications. Their precision machining and high-grade stainless steel construction make them a dependable 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 Drawing Nominal Tube OD Bore Counter Bore Thickness Bolt Circle Dia. Bolt Hole Dia. # of Bolt Holes Thread Size Part Number
DN35CF-DN40CF (2.75" OD) Fixed 316LN SS Tooltip — Blank — 0.50 2.312 0.265 6 — F0275N000NLN
DN35CF-DN40CF (2.75" OD) Fixed Tapped 316LN SS Tooltip — Blank — 0.50 2.312 — 6 M6 x 1.0P F0275N000NMLN
DN35CF-DN40CF (2.75" OD) Rotatable 316LN SS Tooltip — Blank — 0.50 2.312 0.265 6 — F0275N000RLN
DN35CF-DN40CF (2.75" OD) Rotatable Tapped 316LN SS Tooltip — Blank — 0.50 2.312 — 6 M6 x 1.0P F0275N000RMLN
DN35CF-DN40CF (2.75" OD) Fixed Tapped 316LN SS Tooltip — Blank — 0.50 2.312 — 6 1/4-28 F0275N000TLN
DN35CF-DN40CF (2.75" OD) Fixed 316LN SS Tooltip 1 0.94 1.010 0.50 2.312 0.265 6 — F0275N100NLN
DN35CF-DN40CF (2.75" OD) Fixed Tapped 316LN SS Tooltip 1 0.94 1.010 0.50 2.312 — 6 M6 x 1.0P F0275N100NMLN
DN35CF-DN40CF (2.75" OD) Rotatable 316LN SS Tooltip 1 0.94 1.020 0.50 2.312 0.265 6 — F0275N100RLN
DN35CF-DN40CF (2.75" OD) Rotatable Tapped 316LN SS Tooltip 1 0.94 1.020 0.50 2.312 — 6 M6 x 1.0P F0275N100RMLN
DN35CF-DN40CF (2.75" OD) Fixed Tapped 316LN SS Tooltip 1 0.94 1.010 0.50 2.312 — 6 1/4-28 F0275N100TLN
DN35CF-DN40CF (2.75" OD) Fixed 316LN SS Tooltip 1-1/2 1.44 1.510 0.50 2.312 0.265 6 — F0275N150NLN
DN35CF-DN40CF (2.75" OD) Fixed Tapped 316LN SS Tooltip 1-1/2 1.44 1.510 0.50 2.312 — 6 M6 x 1.0P F0275N150NMLN
DN35CF-DN40CF (2.75" OD) Rotatable 316LN SS Tooltip 1-1/2 1.44 1.520 0.50 2.312 0.265 6 — F0275N150RLN
DN35CF-DN40CF (2.75" OD) Rotatable Tapped 316LN SS Tooltip 1-1/2 1.44 1.520 0.50 2.312 — 6 M6 x 1.0P F0275N150RMLN
DN35CF-DN40CF (2.75" OD) Rotatable Tapped 316LN SS Tooltip 1-1/2 1.44 1.520 0.50 2.312 — 6 1/4-28 F0275N150RTLN
DN35CF-DN40CF (2.75" OD) Fixed Tapped 316LN SS Tooltip 1-1/2 1.44 1.510 0.50 2.312 — 6 1/4-28 F0275N150TLN
DN35CF-DN40CF (2.75" OD) Fixed 316LN SS Tooltip 1-5/8 1.56 1.635 0.50 2.312 0.265 6 — F0275N162NLN
DN35CF-DN40CF (2.75" OD) Fixed Tapped 316LN SS Tooltip 1-5/8 1.56 1.635 0.50 2.312 — 6 M6 x 1.0P F0275N162NMLN
DN35CF-DN40CF (2.75" OD) Rotatable 316LN SS Tooltip 1-5/8 1.56 1.645 0.50 2.312 0.265 6 — F0275N162RLN
DN35CF-DN40CF (2.75" OD) Rotatable Tapped 316LN SS Tooltip 1-5/8 1.56 1.645 0.50 2.312 — 6 M6 x 1.0P F0275N162RMLN
DN35CF-DN40CF (2.75" OD) Rotatable Tapped 316LN SS Tooltip 1-5/8 1.56 1.645 0.50 2.312 — 6 1/4-28 F0275N162RTLN
DN35CF-DN40CF (2.75" OD) Fixed Tapped 316LN SS Tooltip 1-5/8 1.56 1.635 0.50 2.312 — 6 1/4-28 F0275N162TLN
DN35CF-DN40CF (2.75" OD) Fixed 316LN SS Tooltip 1-3/4 1.63 1.760 0.50 2.312 0.265 6 — F0275N175NLN
DN35CF-DN40CF (2.75" OD) Rotatable 316LN SS Tooltip 1-3/4 1.63 1.770 0.50 2.312 0.265 6 — F0275N175RLN
DN35CF-DN40CF (2.75" OD) Rotatable Tapped 316LN SS Tooltip 1-3/4 1.63 1.770 0.50 2.312 — 6 M6 x 1.0P F0275N175RMLN
DN35CF-DN40CF (2.75" OD) Fixed Tapped 316LN SS Tooltip 1-3/4 1.63 1.760 0.50 2.312 — 6 1/4-28 F0275N175TLN

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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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