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KF (QF) HV Centering Rings (Al)

KF (QF) HV Centering Rings (Al)

Introduction

KF (QF) HV Centering Rings (Aluminum) are essential sealing components used in KF/QF (NW) vacuum flange connections. They precisely center the elastomer O-ring between mating flanges, ensuring reliable, repeatable sealing in high-vacuum (HV) systems. Aluminum centering rings offer a lightweight, corrosion-resistant alternative ideal for laboratory and modular vacuum assemblies.

Detailed Description

Aluminum KF centering rings are precision-machined to standard KF dimensions to maintain proper alignment and uniform O-ring compression when used with KF clamps. The lightweight aluminum body reduces overall system mass while providing sufficient rigidity for consistent sealing performance.

These centering rings are compatible with standard Viton® or Buna-N O-rings (typically supplied separately or as an assembly upon request). Smooth machined surfaces help minimize particle generation and support clean vacuum operation. Aluminum construction also makes these rings easy to handle and well suited for systems that are frequently assembled and reconfigured.

Key advantages include:

  • Accurate O-ring centering for leak-tight seals

  • Lightweight aluminum construction

  • Full compatibility with standard KF clamps and flanges

  • Suitable for repeated assembly cycles in HV systems

Applications

  • High-vacuum piping and manifolds

  • Thin film deposition systems (PVD, sputtering, evaporation)

  • Laboratory vacuum setups and test rigs

  • Analytical instruments and R&D tools

  • Modular vacuum lines requiring frequent reconfiguration

Technical Parameters

ParameterTypical Value / RangeImportance
MaterialAluminumLightweight, corrosion resistant
Standard SizesKF10, KF16, KF25, KF40, KF50Matches common KF flanges
Sealing ElementO-ring (Viton® / Buna-N)Ensures HV sealing
CompatibilityKF / QF / NW standardsInterchangeable systems
Vacuum RangeUp to ~10⁻⁷ mbar (typical)Suitable for HV applications
FinishPrecision machinedClean, consistent sealing

Comparison with Other Centering Rings

TypeKey AdvantageTypical Application
Aluminum KF Centering RingLightweight, easy handlingLabs & modular HV systems
Stainless Steel KF Centering RingHigher strength, bakeableMore demanding HV/UHV use
Plastic Centering RingLow costLow-duty laboratory setups

FAQ

QuestionAnswer
Are KF, QF, and NW the same standard?Yes, they are interchangeable naming conventions.
Are O-rings included?O-rings are typically supplied separately unless ordered as an assembly.
Is aluminum suitable for UHV systems?Primarily intended for HV; stainless steel is preferred for UHV and bakeout.
Can custom sizes be provided?Yes, custom dimensions can be discussed upon request.
How are the rings cleaned?Cleaned for vacuum service and packed to prevent contamination.

Packaging

Our KF (QF) HV Centering Rings (Aluminum) are cleaned, individually packaged, and protected against surface damage and contamination. Export-grade cartons ensure safe storage and international shipment.

Conclusion

KF (QF) HV Centering Rings (Aluminum) provide a lightweight, reliable solution for sealing KF vacuum connections in high-vacuum systems. With precise machining, standard compatibility, and ease of handling, they are an excellent choice for laboratory, research, and general industrial vacuum applications.
For detailed specifications and a quotation, please contact us at sales@thinfilmmaterials.com.

Ordering Table

KF (QF) HV Centering Rings (Al)

Drawing Flange OD Dim A Dim B O-Ring Material Part Number
Tooltip KF10 0.37 0.47 Buna-N QF10-050-ARB
Tooltip KF16 0.64 0.67 Buna-N QF16-075-ARB
Tooltip KF25 0.93 1.03 Buna-N QF25-100-ARB
Tooltip KF40 1.51 1.61 Buna-N QF40-150-ARB
Tooltip KF50 1.95 2.05 Buna-N QF50-200-ARB
Tooltip KF10 0.37 0.47 Fluorocarbon QF10-050-ARV
Tooltip KF16 0.64 0.67 Fluorocarbon QF16-075-ARV
Tooltip KF25 0.93 1.03 Fluorocarbon QF25-100-ARV
Tooltip KF40 1.51 1.61 Fluorocarbon QF40-150-ARV
Tooltip KF50 1.95 2.05 Fluorocarbon QF50-200-ARV

Accessories Table

Description For VacuCADSM Part Number
O-Ring, KF10, Buna-N QF10 Centering Ring N/A O-B312
O-Ring, KF10, Fluorocarbon QF10 Centering Ring N/A O-V312
O-Ring, KF16, Buna-N QF16 Centering Ring N/A O-B314
O-Ring, KF16, Fluorocarbon QF16 Centering Ring N/A O-V314
O-Ring, KF25, Buna-N QF25 Centering Ring N/A O-B320
O-Ring, KF25, Fluorocarbon QF25 Centering Ring N/A O-V320
O-Ring, KF40, Buna-N QF40 Centering Ring N/A O-B326
O-Ring, KF40, Fluorocarbon QF40 Centering Ring N/A O-V326
O-Ring, KF50, Buna-N QF50 Centering Ring N/A O-B330
O-Ring, KF50, Fluorocarbon QF50 Centering Ring N/A O-V330
N/A APMB

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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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