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KF (QF) to Quick-Connect Couplings

KF (QF) to Quick-Connect Couplings

KF (QF) to Quick-Connect Couplings: Streamlined Transitions for High-Vacuum Integration

The KF (QF) to Quick-Connect Couplings offered by TFM are designed to bridge the gap between KF flange systems and quick-connect tubing couplings, providing an efficient, leak-tight interface for vacuum instrumentation, fluid lines, and diagnostic tools. Constructed from high-purity 304 stainless steel, these adapters meet the demands of both high-vacuum performance and system modularity.

Each adapter features a standard KF (QF) flange on one end—available in KF16, KF25, or KF40 sizes—and a smooth outer diameter (O.D.) tube end designed to form a vacuum joint with compatible quick-connect couplings or compression seals. This enables fast connection to tubulated gauges, fluid lines, or other system components without the need for threading or welding.

Key Features of KF (QF) to Quick-Connect Couplings:

  • Universal Quick-Connect Compatibility
    The smooth O.D. end fits most standard quick-connect couplings and elastomer-sealed fittings, creating a secure, vacuum-tight connection for flexible system design.

  • KF Flange Interface
    Supports easy integration with KF-based vacuum plumbing systems, using standard o-rings and centering rings for fast and reliable sealing.

  • 304 Stainless Steel Construction
    Ensures durability, chemical resistance, and suitability for cleanroom and bakeable vacuum environments.

  • Ideal for Instrumentation
    Commonly used to connect ion gauges, thermocouple gauges, and other diagnostic sensors directly to high-vacuum lines.

  • Available in Dual Coupling Configurations
    For more complex needs, dual-coupling variants allow simultaneous fluid or gas circulation in closed-loop setups.

Applications:

  • Temporary or modular connection of vacuum gauges or sensors

  • Integration of fluid or purge lines into high-vacuum systems

  • Quick setup for R&D test benches, surface science tools, or pumped chambers

  • Facilitating coolant loops or reactive gas lines in process chambers

  • Retrofit solutions where threaded ports are unavailable or undesirable

TFM also supplies a full range of KF to hose adapters, KF to test ports, and KF to baseplate transition fittings, ensuring total connectivity across your vacuum infrastructure.

In summary, KF (QF) to Quick-Connect Couplings are your solution for rapid, tool-free transitions between vacuum flanges and smooth O.D. tubing. Whether you’re calibrating gauges or circulating process gases, these adapters deliver high performance with flexibility built in.

Ordering Table

Flange Size/OD Drawing Nominal Tube OD Dim A Dim B Part Number
KF10 (1.18" OD) Tooltip 1/2 0.52 1.5 QF10XVC050
KF16 (1.18" OD) Tooltip 1/4 0.27 1.4 QF16XVC025
KF16 (1.18" OD) Tooltip 1/2 0.52 1.5 QF16XVC050
KF16 (1.18" OD) Tooltip 3/4 0.77 1.8 QF16XVC075
KF25 (1.57" OD) Tooltip 1/2 0.52 1.5 QF25XVC050
KF25 (1.57" OD) Tooltip 5/8 0.64 1.7 QF25XVC062
KF25 (1.57" OD) Tooltip 3/4 0.77 1.8 QF25XVC075
KF25 (1.57" OD) Tooltip 1 1.02 2 QF25XVC100
KF25 (1.57" OD) Tooltip 1-1/8 1.14 2 QF25XVC112
KF40 (2.16" OD) Tooltip 1/2 0.52 1.5 QF40XVC050
KF40 (2.16" OD) Tooltip 3/4 0.77 1.8 QF40XVC075
KF40 (2.16" OD) Tooltip 1 1.02 2 QF40XVC100
KF40 (2.16" OD) Tooltip 1-1/8 1.14 2 QF40XVC112
KF40 (2.16" OD) Tooltip 1-1/4 1.27 2 QF40XVC125
KF40 (2.16" OD) Tooltip 1-3/8 1.38 2.1 QF40XVC137
KF40 (2.16" OD) Tooltip 1-1/2 1.52 2.4 QF40XVC150
KF50 (2.95" OD) Tooltip 1/2 0.52 1.5 QF50XVC050
KF50 (2.95" OD) Tooltip 3/4 0.77 1.8 QF50XVC075
KF50 (2.95" OD) Tooltip 1 1.02 2 QF50XVC100
KF50 (2.95" OD) Tooltip 1-1/8 1.14 2 QF50XVC112
KF50 (2.95" OD) Tooltip 1-1/2 1.52 2.4 QF50XVC150
KF50 (2.95" OD) Tooltip 2 2.02 2.4 QF50XVC200

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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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