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KF (QF) to ISO-K Adapters

KF (QF) to ISO-K Adapters

KF (QF) to ISO-K Adapters: High Vacuum Flange Transition Between KF and ISO Standards

KF (QF) to ISO-K Adapters by TFM are engineered to provide a robust and leak-tight connection between KF quick flanges and ISO-K flanges, allowing seamless integration of components that use different international vacuum standards. Manufactured from 304 series stainless steel, these adapters offer excellent chemical resistance, structural integrity, and vacuum compatibility across a wide range of laboratory and industrial systems.

The KF (QF) flange system, commonly used in smaller foreline and instrumentation setups, connects easily via quick-clamp assemblies. In contrast, ISO-K flanges are found on larger systems and utilize bolt clamps or double clamps for secure sealing. These adapters serve as a reliable interface between both flange types.

Key Features of KF (QF) to ISO-K Adapters:

  • Cross-System Compatibility
    Designed to connect KF (QF) flanges (e.g., KF16, KF25, KF40) to larger ISO-K flanges (e.g., ISO63, ISO100, ISO160), supporting hybrid vacuum setups.

  • 304 Stainless Steel Construction
    All KF (QF) to ISO-K Adapters are manufactured from high-quality 304 stainless steel, ensuring durability, corrosion resistance, and minimal outgassing in high vacuum applications.

  • Leak-Tight Sealing
    When used with the appropriate centering rings, o-rings, and clamps, these adapters maintain leak-free operation down to 10⁻⁶ – 10⁻⁷ torr or better.

  • No-Weld Design
    Installation is fast and convenient—ideal for systems requiring modularity, retrofits, or field upgrades without custom fabrication.

  • Range of Standard Sizes Available
    TFM supplies a variety of size combinations to accommodate common interface needs. Custom configurations are also available upon request.

Applications:

  • Connecting KF-plumbed instrumentation to ISO-K chamber ports

  • Adapting foreline pumps to ISO-K manifold systems

  • Integrating compact KF gauges or valves into large ISO-K flange assemblies

  • Retrofitting legacy systems using ISO-K to modern KF accessories

  • Building flexible research platforms with cross-standard vacuum compatibility

TFM also offers a wide range of KF adapters, ISO hardware, and custom flange solutions, ensuring your vacuum system remains modular, scalable, and globally compatible.

Ordering Table

Flange Size/OD Drawing Nominal Tube OD Flange Adapter Part Number
KF16 (1.18" OD) Tooltip 3/4 ISO100 QF100XQF16
KF25 (1.57" OD) Tooltip 1 ISO100 QF100XQF25
KF40 (2.16" OD) Tooltip 1-1/2 ISO100 QF100XQF40
KF50 (2.95" OD) Tooltip 2 ISO100 QF100XQF50
KF16 (1.18" OD) Tooltip 3/4 ISO63 QF63XQF16
KF25 (1.57" OD) Tooltip 1 ISO63 QF63XQF25
KF40 (2.16" OD) Tooltip 1-1/2 ISO63 QF63XQF40
KF50 (2.95" OD) Tooltip 2 ISO63 QF63XQF50
KF25 (1.57" OD) Tooltip 1 ISO80 QF80XQF25
KF40 (2.16" OD) Tooltip 1-1/2 ISO80 QF80XQF40
KF50 (2.95" OD) Tooltip 2 ISO80 QF80XQF50

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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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