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KF (QF) HV Stainless Steel Weld Ring Flanges

KF (QF) HV Bored Stainless Steel Flanges (Metric Tube)

KF (QF) HV Bored Stainless Steel Flanges (Metric Tube): Precision KF Vacuum Interfaces for Metric Tubing

KF (QF) HV Bored Stainless Steel Flanges (Metric Tube) are engineered for high-vacuum (HV) systems requiring accurate and durable flange interfaces matched to metric tubing dimensions. These specialized flanges feature a precision-machined bore through the center, enabling seamless alignment and welding or joining with metric-size tubes while preserving full KF quick-flange compatibility.

Each KF (QF) HV Bored Stainless Steel Flange (Metric Tube) is crafted from corrosion-resistant 304L stainless steel, a material selected for its excellent performance in chemically aggressive and high-temperature environments. The flange design incorporates the standard sexless KF (QF) geometry, allowing easy mating with other KF components regardless of orientation, and enabling tool-free assembly using common quick-clamp systems.

The bored opening at the center of each KF (QF) HV Bored Stainless Steel Flange (Metric Tube) is dimensioned precisely to fit standard metric tube sizes, such as 12 mm, 16 mm, 25 mm, or 40 mm. This provides engineers with a clean, concentric surface for welding, brazing, or mechanical tube joining. It is particularly useful in custom vacuum lines, HV instrumentation ports, and manifold assemblies where non-standard tubing must be adapted to standard KF hardware.

The sealing system used with KF (QF) HV Bored Stainless Steel Flanges (Metric Tube) consists of a rubber or elastomeric o-ring seated inside a centering ring. When compressed between two chamfered flange faces using a circumferential clamp—tightened with a wing-nut, thumbscrew, bolt, or over-center lever—the o-ring ensures a leak-tight seal down to 10⁻⁸ torr. The chamfered back surface of the flange plays a critical role in ensuring proper alignment and even pressure distribution during sealing.

Thanks to the 304L stainless steel construction, KF (QF) HV Bored Stainless Steel Flanges (Metric Tube) perform reliably across a wide thermal range, typically between 0 °C and 120–180 °C, depending on the o-ring material selected. This makes them highly suited for both laboratory-scale vacuum setups and industrial HV systems operating in more demanding environments.

TFM offers KF (QF) HV Bored Stainless Steel Flanges (Metric Tube) in standard KF sizes—including KF16, KF25, KF40, and KF50—with bore diameters tailored to match the most common metric tubing dimensions. For specialized configurations, such as tight tolerances, extended lengths, or electropolished finishes for ultra-clean applications, custom fabrication is also available upon request.

In summary, KF (QF) HV Bored Stainless Steel Flanges (Metric Tube) offer a clean, secure, and dimensionally accurate transition point between metric tube assemblies and KF high-vacuum systems. Their robust stainless steel construction, precise machining, and vacuum-sealing reliability make them a go-to choice for vacuum professionals working with international or metric-based infrastructure.

Ordering Table

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

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) 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
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
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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