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KF (QF) HV Stainless Steel Weld Stubs (Inch Tube)

KF (QF) HV Stainless Steel Weld Stubs (Metric Tube)

KF (QF) HV Stainless Steel Weld Stubs (Metric Tube): High-Precision Weldable KF Interfaces for Metric Vacuum Systems

KF (QF) HV Stainless Steel Weld Stubs (Metric Tube) are purpose-built fittings for high-vacuum systems that demand reliable, weldable KF flange connections with metric tubing compatibility. Designed for durability, vacuum integrity, and international dimensional standards, these components are widely used in custom vacuum assemblies, system expansions, and OEM chamber construction.

Each KF (QF) HV Stainless Steel Weld Stub (Metric Tube) features a standard KF (QF) flange at one end and a clean, open tube at the other, allowing for precise welding to stainless steel vacuum lines. This configuration makes it ideal for integrating metric-sized tubing into foreline plumbing, HV chamber ports, and instrumentation access points. By choosing these weld stubs, system builders benefit from both the fast-connect capabilities of the KF flange and the long-term reliability of welded stainless steel tubing.

TFM manufactures KF (QF) HV Stainless Steel Weld Stubs (Metric Tube) using high-purity 304L or 316L stainless steel. These materials offer outstanding corrosion resistance, thermal stability, and weldability, especially in chemically aggressive or thermally dynamic environments. The choice between 304L and 316L allows system designers to match the weld stub to the specific chemical and physical demands of their vacuum application.

The KF (QF) HV flange design follows a sexless, standardized geometry that supports quick assembly using centering rings with elastomeric o-rings and circumferential clamps. The flange mates easily with any other standard KF component, forming a secure, leak-tight seal suitable for pressures down to 10⁻⁸ torr. The chamfered back-surface of each flange ensures proper alignment and compression during clamp installation, while the o-ring configuration accommodates working temperatures from approximately 0 °C to 120–180 °C, depending on the o-ring material used.

A key advantage of KF (QF) HV Stainless Steel Weld Stubs (Metric Tube) is their compatibility with metric vacuum infrastructure, which is increasingly common in global research labs and manufacturing systems. These weld stubs allow seamless connection between metric process piping and standardized KF hardware, eliminating the need for adapters or transitional fittings.

Every KF (QF) HV Stainless Steel Weld Stub (Metric Tube) is produced with tight dimensional tolerances and vacuum-compatible internal finishes to minimize outgassing and ensure long-term stability. They are suitable for TIG or orbital welding and are frequently used in the fabrication of vacuum vessels, beamlines, gas-handling manifolds, and precision foreline layouts.

TFM offers these weld stubs in a variety of KF sizes—such as KF16, KF25, KF40, and KF50—matched with the appropriate metric tube diameters. For applications requiring non-standard lengths, special surface treatments (e.g., electropolishing), or specialized geometries, custom fabrication is available upon request.

In summary, KF (QF) HV Stainless Steel Weld Stubs (Metric Tube) are essential components for vacuum engineers and system integrators working with metric tubing and high-vacuum requirements. Their weldable construction, standardized KF interface, and robust stainless steel build make them the preferred choice for building high-performance, modular vacuum systems.

Ordering Table

Flange Size/OD Type Flange Material Drawing Part Number
KF10 (1.18" OD) Stub, Weld 316L SS QF10-055-SS
KF16 (1.18" OD) Stub, Weld 316L SS QF16-079-SS
KF25 (1.57" OD) Stub, Weld 316L SS QF25-110-SS
KF40 (2.16" OD) Stub, Weld 316L SS QF40-175-SS
KF50 (2.95" OD) Stub, Weld 316L SS QF50-224-SS

Accessories Table

Weld KF (QF) HV Stainless Steel Stubs (Metric Tube) 2

Description For Per Package Part Number
Cast Clamps (SS) KF10, KF16 Flanges 1 QF16-075-CS
Cast Clamps (SS) KF25 Flanges 1 QF25-100-CS
Cast Clamps (SS) KF40 Flanges 1 QF40-150-CS
Cast Clamps (SS) KF50 Flanges 1 QF50-200-CS
Cast Clamps (Aluminum) KF10, KF16 Flanges 1 QF16-075-C
Cast Clamps (Aluminum) KF25 Flanges 1 QF25-100-C
Cast Clamps (Aluminum) KF40 Flanges 1 QF40-150-C
Cast Clamps (Aluminum) KF50 Flanges 1 QF50-200-C
Lever Clamps (Aluminum) KF10, KF16 Flanges 1 QF16-075-CHA
Lever Clamps (Aluminum) KF25 Flanges 1 QF25-100-CHA
Lever Clamps (Aluminum) KF40 Flanges 1 QF40-150-CHA
Centering Ring (SS with Fluorocarbon O-Ring) KF10 Flanges 1 QF10-050-SRV
Centering Ring (SS with Fluorocarbon O-Ring) KF16 Flanges 1 QF16-075-SRV
Centering Ring (SS with Fluorocarbon O-Ring) KF25 Flanges 1 QF25-100-SRV
Centering Ring (SS with Fluorocarbon O-Ring) KF40 Flanges 1 QF40-150-SRV
Centering Ring (SS with Fluorocarbon O-Ring) KF50 Flanges 1 QF50-200-SRV
Description For Per Package Part Number

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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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