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CF to KF (QF) Adapter Flanges

CF to KF (QF) Adapter Flanges

CF to KF (QF) Adapter Flanges: Seamless Integration of UHV and Foreline Flange Standards

CF to KF (QF) Adapter Flanges by TFM are precision-fabricated components designed to connect knife-edge ConFlatĀ® (CF) flanges with quick-flange KF (QF) interfaces. These adapters are essential for hybrid vacuum systems that require interfacing UHV components with high-vacuum foreline hardware. Manufactured from high-quality 304 stainless steel tubing and flanges, they provide long-term durability and leak-tight performance in both research and industrial settings.

Each adapter features a CF flange, compatible with copper gasket sealing for UHV environments, and a KF (QF) flange, which uses elastomer o-ring sealing with quick clamps. This configuration enables rapid setup and reliable cross-system compatibility.

Key Features of CF to KF (QF) Adapter Flanges:

  • Cross-Standard Vacuum Connectivity
    Allows direct connection between CF flanges (e.g., CF16, CF40, CF63) and KF flanges (e.g., KF16, KF25, KF40), enabling smooth transition between UHV and HV systems.

  • 304 Stainless Steel Construction
    All CF to KF (QF) Adapter Flanges are constructed from 304 stainless steel, offering chemical resistance, structural integrity, and compatibility with high-temperature bake-outs.

  • Dual Sealing Systems
    CF flanges use copper gaskets for metal-to-metal UHV sealing; KF flanges rely on elastomer o-rings and clamp systems, allowing for tool-free assembly and quick maintenance.

  • Versatile Applications
    Ideal for laboratories, beamlines, and vacuum equipment where instrumentation with different flange types must be connected reliably and efficiently.

  • Available in Standard and Custom Sizes
    TFM offers commonly used flange combinations and can fabricate custom CF to KF (QF) Adapter Flanges upon request to meet specific dimensional or system requirements.

Applications:

  • Connecting UHV-rated CF chambers or instruments to KF-based pumps or lines

  • Retrofitting legacy KF forelines to interface with modern CF flange devices

  • Supporting analytical systems with mixed flange standards

  • Facilitating quick tool access in hybrid UHV/HV test setups

  • Integrating CF sensors, feedthroughs, or gauges into KF-based assemblies

TFM also supplies a full range of CF and KF components, including clamps, gaskets, nipples, and custom transitionsā€”making the CF to KF (QF) Adapter Flanges a flexible solution for any vacuum integration challenge.

Ordering Table

Flange Size/OD Drawing Nominal Tube OD Flange Adapter Dim A Part Number
DN16CF (1.33" OD) Tooltip 3/4 KF16 1.75 F0133XQF16
DN16CF (1.33" OD) Tooltip 3/4 KF25 1.62 F0133XQF25
DN35CF-DN40CF (2.75" OD) Tooltip 3/4 KF16 1.79 F0275XQF16
DN35CF-DN40CF (2.75" OD) Tooltip 1 KF25 1.79 F0275XQF25
DN35CF-DN40CF (2.75" OD) Tooltip 1-1/2 KF40 1.79 F0275XQF40
DN35CF-DN40CF (2.75" OD) Tooltip 1-3/4 KF40 2.19 F0275XQF40LB
DN50CF (3.38" OD) Tooltip 1-1/2 KF40 1.8 F0337XQF40
DN63CF (4.50" OD) Tooltip 1-1/2 KF40 1.95 F0450XQF40
DN63CF (4.50" OD) Tooltip 2 KF50 1.95 F0450XQF50
DN16CF (1.33" OD) Tooltip 3/4 KF40 1.62 F0133XQF40
DN16CF (1.33" OD) Tooltip 3/4 KF50 1.62 F0133XQF50
DN35CF-DN40CF (2.75" OD) Tooltip 1-1/2 KF50 1.79 F0275XQF50
DN63CF (4.50" OD) Tooltip 1 KF25 1.95 F0450XQF25
DN100CF (6.00" OD) Tooltip 3/4 KF16 1.95 F0600XQF16
DN100CF (6.00" OD) Tooltip 1 KF25 2.01 F0600XQF25
DN100CF (6.00" OD) Tooltip 1-1/2 KF40 2.02 F0600XQF40
DN100CF (6.00" OD) Tooltip 1-1/2 KF50 2.02 F0600XQF50
DN160CF (8.00" OD) Tooltip 1 KF25 2.08 F0800XQF25
DN160CF (8.00" OD) Tooltip 1-1/2 KF40 2.08 F0800XQF40
DN160CF (8.00" OD) Tooltip 2 KF50 2.08 F0800XQF50

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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.

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

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  • 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 pipeā€™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.

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  • 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.

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  • 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 mechanismsā€”pneumatic, electric, or hydraulicā€”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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