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KF (QF) HV Blank Stubs (Brass)

KF (QF) HV Blank Stubs (Aluminum 6061-T6)

KF (QF) HV Blank Stubs (Aluminum 6061-T6): Lightweight Port Sealing for General High-Vacuum Applications

KF (QF) HV Blank Stubs (Aluminum 6061-T6) are high-performance sealing components designed for capping unused ports in high-vacuum (HV) systems. These stubs combine the standardized KF (Klein Flansche) flange design with the lightweight durability of Aluminum 6061-T6, offering vacuum engineers a dependable, cost-effective solution for general-purpose and modular vacuum setups.

Each KF (QF) HV Blank Stub (Aluminum 6061-T6) features a precision-machined KF flange on one end and a closed cylindrical stub on the other, effectively acting as a solid cap that integrates directly into standard KF vacuum assemblies. The design enables system isolation, port protection, and flexible reconfiguration during equipment staging, maintenance, or future upgrades.

The aluminum construction makes these blank stubs exceptionally well-suited for environments where reduced mass and material versatility are essential. Aluminum 6061-T6 offers excellent machinability, corrosion resistance in dry conditions, and good thermal conductivity—qualities that make these components ideal for use in research laboratories, educational setups, prototype vacuum systems, and lightweight instrument builds.

KF (QF) HV Blank Stubs (Aluminum 6061-T6) maintain a secure vacuum seal using a standard elastomeric o-ring housed in a centering ring. When mated with another KF flange and secured using a circumferential clamp—whether with a wing-nut, thumbscrew, bolt, or over-center lever—the connection achieves a reliable seal rated for pressures down to 10⁻⁸ Torr. The o-ring also defines the system’s operating temperature range, typically between 0 °C and 120–180 °C, depending on the o-ring material selected.

These blank stubs are most frequently used in systems where flexibility and frequent changes are part of the process—such as vacuum R&D platforms, modular diagnostic chambers, and test benches. Their KF compatibility allows quick installation and removal without tools, reducing system downtime and supporting cleanroom best practices.

TFM offers KF (QF) HV Blank Stubs (Aluminum 6061-T6) in all standard KF sizes, including KF16, KF25, KF40, and KF50, to accommodate a wide range of system configurations. Each component is manufactured with tight dimensional tolerances and finished to vacuum-grade standards to ensure consistency and performance. Custom options such as vent holes, extended stub lengths, or laser-marked identification are available upon request.

In summary, KF (QF) HV Blank Stubs (Aluminum 6061-T6) are the lightweight, cost-efficient solution for capping unused KF ports in general high-vacuum applications. Their blend of performance, flexibility, and standardization makes them an essential component in the toolkit of any vacuum system designer or technician.

Ordering Table

Flange Size/OD Type Flange Material Drawing Part Number
KF10 (1.18" OD) Stub, Blank 6061-T6 Aluminum Tooltip QF10-050-UA
KF16 (1.18" OD) Stub, Blank 6061-T6 Aluminum Tooltip QF16-075-UA
KF25 (1.57" OD) Stub, Blank 6061-T6 Aluminum Tooltip QF25-100-UA
KF40 (2.16" OD) Stub, Blank 6061-T6 Aluminum Tooltip QF40-150-UA
KF50 (2.95" OD) Stub, Blank 6061-T6 Aluminum Tooltip QF50-200-UA

Accessories Table

Description For Per Package Part Number
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 (Aluminum with Fluorocarbon O-Ring) KF10 Flanges 1 QF10-050-ARV
Centering Ring (Aluminum with Fluorocarbon O-Ring) KF16 Flanges 1 QF16-075-ARV
Centering Ring (Aluminum with Fluorocarbon O-Ring) KF25 Flanges 1 QF25-100-ARV
Centering Ring (Aluminum with Fluorocarbon O-Ring) KF40 Flanges 1 QF40-150-ARV
Centering Ring (Aluminum with Fluorocarbon O-Ring) KF50 Flanges 1 QF50-200-ARV

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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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