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KF (QF) HV Blank Flanges (Brass)

KF (QF) HV Blank Flanges (304L SS)

KF (QF) HV Blank Flanges (304L SS): High-Performance Sealing for Critical Vacuum System Integrity

KF (QF) HV Blank Flanges (304L SS) are precision-engineered components used to seal off unused ports in high-vacuum (HV) systems, ensuring structural integrity, operational flexibility, and leak-free performance. Manufactured to ISO standards for Klein Flansche (KF) fittings, these blank flanges are essential for vacuum system builders who demand consistent sealing and compatibility across their foreline and chamber components.

Constructed from high-purity 304L stainless steel, KF (QF) HV Blank Flanges (304L SS) offer excellent resistance to high temperatures, mechanical stress, and corrosive environments—making them ideal for challenging laboratory, semiconductor, and industrial vacuum applications. These blank flanges are designed to be used with standard KF flange assemblies, providing a reliable and easily removable sealing option for any unused port.

The sealing mechanism of each KF (QF) HV Blank Flange (304L SS) relies on a rubber or elastomeric o-ring held in place by a centering ring. When mated with another KF flange using a circumferential clamp—secured via wing-nut, thumbscrew, bolt, or over-center lever—the result is a tight, repeatable vacuum seal capable of withstanding pressures down to 10⁻⁸ Torr. The back surface of the blank flange is chamfered to ensure proper alignment and compression of the o-ring during sealing.

The 304L stainless steel used in these KF (QF) HV blank flanges is known for its low carbon content, making it particularly resistant to intergranular corrosion after welding or prolonged exposure to high temperatures. This ensures long-term durability and cleanliness in applications involving chemical vapors, reactive gases, or thermal cycling. It is the material of choice for systems requiring the highest standards of vacuum integrity and reliability.

These KF (QF) HV Blank Flanges (304L SS) are suitable for use in vacuum systems with thermal ranges of 0 °C to 120–180 °C, depending on the o-ring compound. They are frequently installed in vacuum deposition chambers, analytical equipment, cryogenic systems, and high-vacuum research setups where modularity and future port accessibility must be preserved.

Available in standard KF sizes including KF16, KF25, KF40, and KF50, TFM’s blank flanges are machined to tight tolerances to ensure a consistent sealing surface. For advanced applications, we also offer customized versions with features such as vent holes, precision-polished surfaces, or laser-engraved part IDs to support system tracking and validation.

In summary, KF (QF) HV Blank Flanges (304L SS) provide a durable, chemically resistant, and vacuum-compatible method for sealing KF ports in high-performance environments. Their material reliability, easy installation, and ISO-standard compatibility make them a trusted component in both industrial and scientific vacuum systems.

Ordering Table

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

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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