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KF to Swagelok® Adapter

KF to Swagelok® Adapter

KF to Swagelok® Adapter: Reliable Vacuum-to-Tube Transitions with Leak-Free Integrity

The KF to Swagelok® Adapter, offered by TFM, provides a precision interface between KF (QF) vacuum flanges and Swagelok® compression fittings, enabling smooth integration between high-vacuum systems and high-purity process lines. Designed for environments where both cleanliness and sealing reliability are paramount, this adapter supports quick-connect vacuum flanges and torque-free Swagelok sealing technology in one robust component.

Machined from 304 series stainless steel, the adapter offers exceptional strength and corrosion resistance, making it ideal for laboratory vacuum setups, semiconductor manufacturing, and chemical process systems. Its compact, modular design simplifies system layout while maintaining the leak-tight performance expected in high-vacuum or clean gas delivery applications.

Key Features of KF to Swagelok® Adapter:

  • Cross-System Connectivity
    Enables direct connection between KF-style vacuum flanges (e.g., KF16, KF25, KF40) and Swagelok® compression tube fittings without additional transitions.

  • Torque-Free Sealing Technology
    Swagelok’s patented design creates a leak-free seal through radial compression rather than torque, minimizing risk of thread damage or leaks over time.

  • 304 Stainless Steel Construction
    Ensures durability, vacuum compatibility, and long-term chemical resistance in demanding environments.

  • Modular and Removable
    The KF flange allows fast, tool-free connection to vacuum ports via clamp-and-o-ring assemblies, while the Swagelok end can be connected to standard tubing using compression ferrules.

  • Vacuum and Pressure Performance
    – KF flange rated for HV conditions down to ~10⁻⁷ torr
    – Swagelok end rated for pressures up to 3000 psig, depending on fitting size and tubing specifications

  • Flexible System Integration
    Ideal for systems requiring transition between vacuum chambers and gas delivery tubing, including purge lines, sample inlets, and vent systems.

Applications:

  • Analytical instruments with vacuum and gas interface requirements

  • High-vacuum chambers needing integration with standard 1/4″, 3/8″, or 1/2″ process lines

  • Semiconductor tools where Swagelok purity and KF modularity are both required

  • Gas handling systems that must connect to vacuum environments

  • Pilot plants and test benches for flexible process control

TFM also provides CF to Swagelok® Adapters, KF to VCR® face-seal adapters, and KF-to-compression tube transitions, enabling full system flexibility and purity assurance.

In conclusion, the KF to Swagelok® Adapter bridges vacuum technology and process engineering with a compact, leak-tight, and UHV-capable solution. Whether you’re building a new vacuum line or retrofitting process equipment, TFM’s adapter ensures compatibility, performance, and clean operation every time.

Ordering Table

Flange Size/OD Drawing Fitting Part Number
KF16 (1.18" OD) Tooltip 1/16" Swagelok QF16X1SWG
KF16 (1.18" OD) Tooltip 1/8" Swagelok QF16X2SWG
KF16 (1.18" OD) Tooltip 1/4" Swagelok QF16X4SWG
KF16 (1.18" OD) Tooltip 3/8" Swagelok QF16X6SWG
KF16 (1.18" OD) Tooltip 1/2" Swagelok QF16X8SWG
KF25 (1.57" OD) Tooltip 1/16" Swagelok QF25X1SWG
KF25 (1.57" OD) Tooltip 1/8" Swagelok QF25X2SWG
KF25 (1.57" OD) Tooltip 1/4" Swagelok QF25X4SWG
KF25 (1.57" OD) Tooltip 3/8" Swagelok QF25X6SWG
KF25 (1.57" OD) Tooltip 1/2" Swagelok QF25X8SWG
KF40 (2.16" OD) Tooltip 1/16" Swagelok QF40X1SWG
KF40 (2.16" OD) Tooltip 1/8" Swagelok QF40X2SWG
KF40 (2.16" OD) Tooltip 1/4" Swagelok QF40X4SWG
KF40 (2.16" OD) Tooltip 3/8" Swagelok QF40X6SWG
KF40 (2.16" OD) Tooltip 1/2" Swagelok QF40X8SWG

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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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