Introduction
KF (QF) HV Standard Tees are essential components in modular high-vacuum (HV) piping systems, designed to create clean and reliable branch connections. Widely adopted in laboratories, semiconductor tools, and industrial vacuum equipment, KF/QF tees offer fast assembly, excellent sealing performance, and broad compatibility with standardized vacuum hardware.
Detailed Description
KF (also known as QF or NW) standard tees are manufactured in accordance with international vacuum standards (ISO 2861 / DIN 28404), ensuring interchangeability across systems and suppliers. These tees enable a 90-degree branch in a vacuum line while maintaining stable pressure and minimal leakage.
The sealing mechanism relies on an elastomer O-ring centered by a precision metal clamp and supported by a centering ring. This design allows for rapid installation and removal without bolts, making KF tees ideal for systems that require frequent reconfiguration or maintenance.
Typically produced from high-quality stainless steel (304 or 316L), KF HV standard tees provide:
Low outgassing characteristics suitable for HV environments
Smooth internal surfaces to reduce particle generation and turbulence
High mechanical strength and corrosion resistance
Optional surface treatments such as electropolishing can further enhance cleanliness for sensitive vacuum processes.
Applications
High-vacuum piping and manifold systems
Thin film deposition equipment (PVD, sputtering, evaporation)
Semiconductor process tools and R&D chambers
Analytical instruments and mass spectrometry
Vacuum furnaces and pumping lines
Technical Parameters
| Parameter | Typical Value / Range | Importance |
|---|---|---|
| Material | Stainless Steel 304 / 316L | Ensures durability and low outgassing |
| Standard Sizes | KF10, KF16, KF25, KF40, KF50 | Matches common HV vacuum lines |
| Connection Type | KF (QF / NW) | Enables quick clamp assembly |
| Sealing Method | Elastomer O-ring with centering ring | Provides reliable vacuum seal |
| Surface Finish | Machined / Electropolished (optional) | Affects cleanliness and particle control |
| Vacuum Range | Up to 10⁻⁷ mbar (typical) | Suitable for high-vacuum systems |
Comparison with Related Vacuum Fittings
| Fitting Type | Key Advantage | Typical Application |
|---|---|---|
| KF (QF) HV Standard Tee | Fast assembly, modular design | HV labs & process tools |
| ISO-K Tee | Larger diameters, higher flow | Industrial vacuum systems |
| CF Tee | Metal gasket, UHV capability | Ultra-high-vacuum systems |
FAQ
| Question | Answer |
|---|---|
| Are KF and QF the same standard? | Yes. KF, QF, and NW refer to the same standardized vacuum flange system. |
| What O-ring materials are available? | Common options include Viton®; others are available on request. |
| Can these tees be used in UHV systems? | They are mainly for HV; CF fittings are recommended for UHV. |
| Are custom sizes or lengths available? | Standard sizes are stocked; custom configurations can be produced. |
| How are they cleaned and packed? | Ultrasonically cleaned and packed to prevent contamination. |
Packaging
Our KF (QF) HV Standard Tees are carefully cleaned, capped, and individually packed to protect sealing surfaces. Each unit is labeled for easy identification and shipped in protective foam with export-grade cartons to ensure safe delivery.
Conclusion
KF (QF) HV Standard Tees provide a practical and reliable solution for branching high-vacuum lines with minimal downtime and maximum flexibility. Their standardized design, robust materials, and ease of use make them a preferred choice for both research and industrial vacuum systems.
For detailed specifications and a quotation, please contact us at sales@thinfilmmaterials.com.
Ordering Table
| Flange Size/OD | Type | Flange Material | Drawing | Nominal Tube OD | Wall Thickness | Part Number |
| KF16 (1.18" OD) | Tee | 304L SS |
| 3/4 | 0.065 | QF16-075-T |
| KF16 (1.18" OD) | Tee | 6061-T6 Aluminum |
| 7/8 | 0.144 | QF16-075-TAL |
| KF25 (1.57" OD) | Tee | 304L SS |
| 1 | 0.065 | QF25-100-T |
| KF25 (1.57" OD) | Tee | 6061-T6 Aluminum |
| 1.28 | 0.168 | QF25-100-TAL |
| KF40 (2.16" OD) | Tee | 304L SS |
| 1-1/2 | 0.065 | QF40-150-T |
| KF40 (2.16" OD) | Tee | 6061-T6 Aluminum |
| 1.83 | 0.108 | QF40-150-TAL |
| KF50 (2.95" OD) | Tee | 304L SS |
| 2 | 0.065 | QF50-200-T |
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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