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KF (QF) HV Blank Stubs (Brass)

KF (QF) HV Blank Stubs (Brass)

KF (QF) HV Blank Stubs (Brass): Reliable Port Sealing for General High-Vacuum Applications

KF (QF) HV Blank Stubs (Brass) are practical, cost-effective components used to permanently or temporarily seal unused KF ports in high-vacuum (HV) systems. Designed in accordance with ISO-standard KF (Klein Flansche) geometry, these blank stubs integrate seamlessly with existing KF flange hardware and are ideal for laboratory, OEM, and light industrial vacuum applications operating down to 10⁻⁸ Torr.

Constructed from high-quality brass, KF (QF) HV Blank Stubs (Brass) are well-suited for general-purpose vacuum environments where extreme corrosion resistance and high-temperature durability are not essential. Brass offers good machinability, thermal conductivity, and ease of handling, making these stubs ideal for use in modular or reconfigurable systems where port capping or future expansion is expected.

Each KF (QF) HV Blank Stub (Brass) features a KF flange at one end and a closed-off stub or tube section on the other. This design allows the component to function as a solid end-cap while still maintaining compatibility with standard KF elastomeric o-ring sealing systems. The o-ring, housed in a centering ring, is compressed between chamfered flange faces using a KF clamp—which may be a wing-nut, thumbscrew, bolt-style, or over-center lever variant. This results in a dependable, leak-tight seal for vacuum pressures from atmosphere down to ultra-high vacuum levels.

Because of their brass construction, KF (QF) HV Blank Stubs (Brass) are not recommended for corrosive or reactive gas environments but excel in applications where lightweight, non-magnetic, and low-cost components are desirable. They are especially useful in educational laboratories, general R&D setups, small-scale vacuum coating systems, or prototype vacuum assemblies.

These blank stubs also serve as effective temporary seals during maintenance, system bakeouts, or phased equipment installation. They can be removed and reused repeatedly thanks to their robust flange construction and compatibility with reusable KF clamps and centering rings.

TFM offers KF (QF) HV Blank Stubs (Brass) in standard KF flange sizes, including KF16, KF25, KF40, and KF50, to suit common vacuum system dimensions. All components are machined to meet precise tolerances and ensure proper mating with other ISO-KF hardware. Custom variants, such as extended stubs or vented versions, are available upon request.

In summary, KF (QF) HV Blank Stubs (Brass) provide a dependable and economical method for sealing KF ports in high-vacuum systems. Their compatibility, ease of use, and material affordability make them an essential utility component in vacuum system construction, maintenance, and testing.

Ordering Table

Flange Size/OD Type Flange Material Drawing Part Number
KF10 (1.18" OD) Stub, Blank 360 Brass Tooltip QF10-050-UB
KF16 (1.18" OD) Stub, Blank 360 Brass Tooltip QF16-075-UB
KF25 (1.57" OD) Stub, Blank 360 Brass Tooltip QF25-100-UB
KF40 (2.16" OD) Stub, Blank 360 Brass Tooltip QF40-150-UB
KF50 (2.95" OD) Stub, Blank 360 Brass Tooltip QF50-200-UB

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

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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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