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

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

KF (QF) HV Stainless Steel Weld Stubs (Inch Tube): Trusted Weldable KF Flange Connections for Inch-Based Vacuum Systems

KF (QF) HV Stainless Steel Weld Stubs (Inch Tube) are precision-engineered components designed for high-vacuum (HV) systems that rely on inch-dimension tubing. Each weld stub incorporates a standard KF (QF) flange on one end and an open stainless steel tube on the other, allowing engineers to directly weld the stub into custom vacuum assemblies, foreline manifolds, or HV chamber ports.

At the core of the design, the KF (QF) HV Stainless Steel Weld Stub (Inch Tube) offers seamless integration with standard KF hardware while maintaining compatibility with widely used inch-based vacuum infrastructure. Whether used in research laboratories, process chambers, or OEM systems, these weld stubs offer the ideal combination of modularity, material reliability, and high-vacuum readiness.

TFM fabricates KF (QF) HV Stainless Steel Weld Stubs (Inch Tube) from 304L or 316L stainless steel, providing excellent mechanical strength, corrosion resistance, and weldability. The 304L variant serves most general HV applications effectively, while the 316L option is preferred in more aggressive or chemically active environments where additional corrosion resistance is essential.

The KF (QF) flange used in these weld stubs follows the proven sexless design standardized across high-vacuum systems. Its sealing mechanism consists of an elastomeric o-ring housed in a centering ring, compressed between two chamfered flange faces using a circumferential clamp. This configuration offers reliable leak-tight performance from atmosphere down to 10⁻⁸ torr, with thermal operation limits dictated by the o-ring—typically between 0 °C and 120–180 °C.

Engineers working with inch tube systems benefit from the KF (QF) HV Stainless Steel Weld Stub (Inch Tube) by gaining the flexibility to connect non-flanged tubing to standardized vacuum ports or inline assemblies. The weld-ready tube end is ideal for TIG or orbital welding, making these stubs particularly valuable during chamber construction, vacuum line retrofitting, or the integration of custom-built foreline components.

Each KF (QF) HV Stainless Steel Weld Stub (Inch Tube) is finished to vacuum-grade standards, ensuring minimal outgassing and long-term reliability under HV and UHV conditions. TFM offers a full range of standard KF sizes—including KF16, KF25, KF40, and KF50—with corresponding inch-sized tube diameters. For non-standard lengths, flange types, or finish specifications, we provide custom fabrication options to meet specific vacuum design requirements.

In summary, KF (QF) HV Stainless Steel Weld Stubs (Inch Tube) deliver dependable, weldable KF flange connectivity for inch-based tubing systems. Their robust stainless steel construction, high vacuum compatibility, and easy integration make them a foundational component in the development of precision vacuum systems across science, industry, and OEM engineering.

Ordering Table

Flange Size/OD Type Flange Material Drawing Part Number
KF10 (1.18" OD) Stub, Weld 304L SS Tooltip QF10-050-SS
KF16 (1.18" OD) Stub, Weld 304L SS Tooltip QF16-050-SS
KF16 (1.18" OD) Stub, Weld 304L SS Tooltip QF16-075-SS
KF25 (1.57" OD) Stub, Weld 304L SS Tooltip QF25-100-SS
KF40 (2.16" OD) Stub, Weld 304L SS Tooltip QF40-150-SS
KF40 (2.16" OD) Stub, Weld 304L SS Tooltip QF40-150-SST
KF50 (2.95" OD) Stub, Weld 304L SS Tooltip QF50-200-SS
KF50 (2.95" OD) Stub, Weld 304L SS Tooltip QF50-200-SST
KF25 (1.57" OD) Stub, Weld 316L SS Tooltip QF25-100-SSL
KF40 (2.16" OD) Stub, Weld 316L SS Tooltip QF40-150-SSL
KF50 (2.95" OD) Stub, Weld 316L SS Tooltip QF50-200-SSL

Accessories Table

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

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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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